Could also do as part of a gallery wall, or in a grouping with other similar frames (either with all birds or other things like trees, butterflies etc.) I might prefer to have the birds flying out of the frame instead of into it.
Make these shelves removable with train tracks on them for Tommy to play with. 'The imagination shown on this site blew me away. Great ideas for kids rooms (heck, I wouldn't mind having some of these things in my room!