I use a variety of different hides, including both store-bought and homemade...
X-Small Exoterra cave (with a baby OG)
http://i131.photobucket.com/albums/p...4/IMG_1499.jpg
Random plastic bowl, I think from the Dollar Store - couldn't find anything store-made for this fat corn!
http://i131.photobucket.com/albums/p...4/IMG_1488.jpg
She used to have a cardboard box, until it got nasty.
http://i131.photobucket.com/albums/p...2/DSCF5132.jpg
XL Exoterra, with a BP who's obviously in need of an upgrade... LOL. :D
http://i131.photobucket.com/albums/p...4/IMG_1238.jpg
They make these in larger sizes, but this little corn LOVES hers!
http://i131.photobucket.com/albums/p...4/IMG_0374.jpg
Upside-down Animal Plastics hide (I think in Large?) with a 2yo Lesser girl... these are my favorite hides, and they're very reasonably priced.
http://i131.photobucket.com/albums/p...4/IMG_0810.jpg
Another homemade plastic bowl hide, which my JCP has now outgrown... so this thread will be useful, since he needs a new one.
http://i131.photobucket.com/albums/p...4/IMG_0227.jpg
Yogurt tubs work great for small snakes, so maybe plastic buckets for adults?
http://i131.photobucket.com/albums/p...s/DSCF3444.jpg
And finally, the kitty litter box... great for BIG BPs, but unfortunately this girl didn't like hers (she prefers no hide).
http://i131.photobucket.com/albums/p...s/DSCF2815.jpg