A Mintpass designer turned to Windows XP and Mac OS for inspiration and came up with these nifty OS Calculators. Yes, the “Windows calculator sports the classic XP color scheme, and even has menu headers.” More pictures after the break.

The designer is aware of the fact that it would be unlikely for either Apple or Microsoft to let any third party get away with making these calculators, so is leaving it up to the two computer makers to make real-life versions of their OS calculators.

[via Technabob]