Upside down table for a toddler bed or dog bed - very smart! I would add some very short legs underneath just so it isn't sitting right on the ground.
We're going to do something very similar to this in between our raised beds to grow pea plants on this summer. It will be like a living tunnel for the kids to play in.
GENIUS DIY UNDER THE BED STORAGE SOLUTION. Great upcycle idea for storage under the bed, made from an old bookshelf.