FreeGEM is the community-maintained, open-source continuation of Digital Research's GEM (Graphics Environment Manager), the 1980s GUI that dressed up DOS and the Atari ST. Like the hardware it grew up on, it fakes its desktop color by dithering — checkerboarding gray (#a8a8a8) and pure blue (#0000ff) in equal measure. Averaged as pixels that blends to #5454d4; averaged in linear light it becomes the gamma-corrected #7a7ad9.
Preview#5454d4
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Dithered Blue (Averaged)
#5454d4
Dithered Blue (Gamma-Corrected)
#7a7ad9
Stone Gray
#a8a8a8
Blue
#0000ff
Dithered Blue (Averaged)DEFAULT
The FreeGEM desktop. There's no single color for it — the desktop is dithered, checkerboarding gray (#a8a8a8) and blue (#0000ff) in an even 1:1 pattern. This is the conventional pixel average of the two; averaging in linear light instead gives the gamma-corrected #7a7ad9.