These wallpapers were made in Gimp from 7 copies of the Bold GNU Head, rotated clockwise about 15 degrees and organized in two staggered rows over a lavander background. The heads on both ends of the first row are cut off so the whole image can be repeated to cover a larger area. Kacper explains how he obtained the embossed versions:

It was quite simple, really, I chose the layer with the GNU heads and applied a filter called “emboss”. You can find it using the toolbar by going: Filters > Distorts > Emboss. At first when you choose it, you can see that it gets rid of any color the embossed layer has. You can change that by using a different emboss type called “Bumpmap”. That should preserve the colors. Once the change has been done, the wallpaper is unfortunately not ready yet. The cut-off heads on the sides will have to be replaced with heads that weren't cut off before embossing so the wallpaper looks right.

	Flat tiling (510x330) PNG 675kB,  XCF 167kB
	Embossed tiling Filter type: Bumpmap Settings: Azimuth = 30, Depth = 1, Elevation = 35 PNG 682kB,  XCF 216kB
	Subtly embossed tiling Filter type: Bumpmap Settings: Azimuth = 30, Depth = 1, Elevation = 100 PNG 681kB,  XCF 206kB