B.C.
I went to Dollar Tree and got some really cute green bins that are open topped. I got three. One for color books and crayons, one for play-doh stuff, and one for arts and crafts. I stick them all on top of the fridge so that they can't reach it, and it's all organized for when they want to play it.
We also have a ton of little people stuff in the playroom, so I bought a clear plastic bin that will fit underneath the train table to store them in while not in use.
We have plastic drawers in my 3 y/o's closet with labels on them for socks, shorts, games, etc. and we also got a toy organizer bin. One for legos, one for doll stuff, one for dress up, one for tea set, one for little animals, etc.