Despite the "blue screen" name, Windows fatal error screens sometimes can be also displayed with other background colours; in Windows 9x, the colour of the message could be even customised by the user.

AFAIK Windows BSOD color can be customized in every newer version too, did that once on my Win 7 machine. Apparently the reasoning for implementing this feature is to allow users with visual impairment to set the BSOD to appear in high contrast colors.