Last month I mentioned a Commodore-64 designed out of Lego [1]. Back then, it was just a design, but now it actually exists [2]! There are two keyboards—one where a real Commodore-64 keyboard has the keycaps swapped out for Lego keycaps, and the second keyboard is a fully mechanical Lego design.
I think it would be possible to use the pure Lego keyboard on a real computer, but it would probably require a custom PCB (Printed Circuit Board) to handle the different mechanical action. Size wise, it's a perfect fit though. And boy, does it have that sweet clicky sound of a mechanical keyboard.