I was wondering if y'all could help me.

Im gonna customise a cheap keyboard I found lying around for a laugh over xmas. Was gonna try and light it up from inside with some E.L String. I was wondering if this was possible as I cant find any help online...I guess it needs an inverter?! But I dont know if this will fit inside a keyboard. If its not possible at all, no worries!

Oh, as an aside, is it possible to buy new keys for a keyboard.....in a different colour?

Cheers all