bought lots of wrong item, project ideas?

I bought over 250 momentary buttons by mistake (two pin, 5 mm, SPST). I can't return them. Any cool, fun, interesting and/or very easy Arduino project ideas I can do with as many of these buttons as possible?? I have a little bit of everything in terms of LEDs, motors, sensors and shields - just no creativity LOL. I also have kids under the age of six, so anything that they can interact with is a plus.

What do they look like?

Make a piano out of it. 88 buttons for the 88 keys.

Read about charlieplexing

Make a game like battleship

Crossroads has a board that allows you to light 64 LEDs with the SPI bus.

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