Can you give me suggestions for creating a storage in a playroom?

measure opening and get frames from dollar store and use them. u can put pictures or painted boards really to almost anything and can adjust to childs age

Sounds like an IKEA project. Check out the Billy bookshelves...you can place them on their sides for the cube affect . Good luck.

I'd look at ready made unfinished cabinets at Home Depot and come up with your configuration. Can paint in fun colors.