Windows 10 Technical Preview

Windows 10 Technical Preview was the first phase of Windows 10's Insider Program. It was renamed to Insider Preview in build 10071. Due to no significant wallpaper changes occurring beyond the development of the initial release, this page will only cover the wallpaper development leading up to that point, however, it still covers the development even after it became Insider Preview.

Wallpapers

Builds 9780 to 9888

At this point in development, Windows 10's wallpapers are identical to 8.1's, except that img0 and img1 have been swapped, resulting in 8.1's img1 becoming the default wallpaper.

Builds 9900 to 10151

All of the Lines and colors wallpapers leftover from Windows 8.1 have been removed and replaced with a completely different theme, consisting of stock photos mostly licensed from Getty Images, most of which use rights-managed licenses. None of these appear in the final release, as they were simply placeholders until Steve McCurry and Chad Copeland's wallpapers were added. However, build 10138 replaces the default wallpaper with wallpaper that's slightly different from img2 in the final release, although the other wallpapers remain intact at this point. The Flowers theme, which has been present since Windows 8, also remains intact throughout.

	Name	Original filename	Category	Licensed from	Originates from	Photographer/artist	Notes
	img0 (builds 9900 to 10135)	unknown	Windows	Getty Images	F1 Online	Franz Pritz	Removed in build 10138
	img0 (builds 10138 to 10151)	Chad-Copeland-1000-4_v02_2	Windows	N/A	commissioned by Microsoft	Chad Copeland	Reallocated to img1 in build 10154
	img1	unknown	Windows Technical Preview	Getty Images	Gallo Images	Martin Harvey	Removed in build 10151
	img2	unknown	Windows Technical Preview	Getty Images	unknown	unknown	Removed in build 10151
	img3	unknown	Windows Technical Preview	Getty Images	Getty Images	Werner Van Steen	Removed in build 10151
	img7	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img8	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img9	unknown	Flowers	N/A	Microsoft	unknown	Panoramic Reused from Windows 8
	img10	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img11	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img12	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img13	unknown	Windows Technical Preview	iStock	iStock	Sara Winter	Panoramic Not configured for the theme file to use despite being present in the same directory

Builds 10154 to 10158

With the exception of img13, all of the placeholder wallpapers were replaced with photos taken by McCurry and Copeland. The wallpaper that would later become img1 is the default wallpaper here, with the previous default wallpaper being reallocated to img1, slightly moved to the left and the light part recolored to blue.

	Name	Original filename	Category	Licensed from	Originates from	Photographer/artist	Notes
	img0	beach_2	Windows	N/A	commissioned by Microsoft	Steve McCurry Chris Raykovich (runner photo, edited into the wallpaper)	Default wallpaper from builds 10154 to 10158 Reallocated to img1 in build 10159
	img1	Chad-Copeland-1000-4_v02_2	Windows 10	N/A	commissioned by Microsoft	Chad Copeland	Slightly moved to the left and have the light recolored to blue from img0 in build 10138 to 10151 Reallocated to img2 in build 10159
	img2	Chad-Copeland-2001_2	Windows 10	N/A	commissioned by Microsoft	Chad Copeland	Reallocated to img3 in build 10159
	img3	Chad-Copeland-2002_2	Windows 10	N/A	commissioned by Microsoft	Chad Copeland	Reallocated to img4 in build 10159
	img7	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img8	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img9	unknown	Flowers	N/A	Microsoft	unknown	Panoramic Reused from Windows 8
	img10	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img11	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img12	unknown	Flowers	N/A	Microsoft	unknown	Reused from Windows 8
	img13	unknown	Windows 10	iStock	iStock	Sara Winter	Panoramic Removed in build 10159

Build 10159 onwards

At this point, the default wallpaper has been changed to the one that appears in the final release, while img13 is changed to a panoramic version of img4. Microsoft described the new wallpaper as an "interesting change". As a result, all of the McCurry and Copeland wallpapers added in build 10154 had their numbers increased by one.

Lock screen wallpapers

Builds 9780 to 9888

At this point in development, Windows 10's lock screen wallpapers are identical to 8.1.

Builds 9900 to 10158

The Windows 8 lock screen wallpaper set was replaced with a new set of images; much like the desktop wallpapers, these are also mostly stock photos licensed from Getty Images, although most of them use a royalty free license instead. With the exception of img103 (later reallocated to img105), none of the images appeared in the final release, as they were simply placeholders until Steve McCurry and Chad Copeland's wallpapers were added.

	Name	Licensed from	Originates from	Photographer/artist	Notes
	img100	Getty Images	Flickr	Kelly Lane	Default lock screen wallpaper
	img101	unknown	unknown	unknown
	img102	Getty Images	Flickr	Carlos Alberto	Fallback for Windows spotlight in build 10074
	img103	N/A	Microsoft	unknown	Reallocated to img105 in build 10159
	img104	Getty Images	National Geographic	Jonathan Kingston
	img105	Getty Images	J J D	unknown (credited on Getty to J J D)

Build 10159 onwards

At this point, all of the lock screen wallpapers are replaced with the same ones that appear in the RTM release onwards.

User account pictures

Windows 10 used the same user account pictures from Windows 8 and 8.1 up to build 10102.

Builds 10108 to 10131 use user account pictures that are somewhat reminiscent of the RTM ones, but the person in the picture is drawn with thinner lines and cropped more like the 8 and 8.1's.

	Name	Licensed from	Originates from	Photographer/artist	Notes
	guest	unknown	Microsoft	unknown	Copy of the user account picture
	user	unknown	Microsoft	unknown

By build 10134, these were replaced with their final variants.