Lowercase and uppercase floor alphabet game

Both the littlies are interested in upper and lower case letters at the moment. There seems to have been a little light that's been switched on in my youngest daughters head since she turned three this week and she's been pointing out letters in both cases and keeps telling me "they are both an A mama!" or "this is a little B and this is a big one!" It's really cute. My older daughter, who is four and a half, is completely incredulous towards her little sister's revelation, because she figured this stuff out a while ago, but she still likes games of matching things up and loves to colour things, so this suited them both.

I got an old roll of fax paper at a garage sale a while back, thinking for 25cents I was bound to be able to use it for something. It was useful for this! I drew out the uppercase alphabet in order on the fax paper using a sharpie pen and taped it to the kitchen floor, then wrote out the lower case letters on some index cards and the kids coloured them in with crayons and matched them up with the correct upper case letters. I guess I could have encouraged them to colour the upper case and corresponding lower case letter in the same colour, but they were having too much fun doing the multicoloured thing.

It would be easy enough to make a smaller board game type version of this, or even some sort of bingo game where the kids have to find the upper case letter on their board from the lower case letter drawn at random. If I get around to figuring out a board game then I'll post it here too.