I already got some for x-mas. Caves sound fun! For my birthday, I'm getting a 30-40 gallon tank, so I can move my big plants and decor into there and put some hand made decor into the 10g I have! ^^ I think, since it's safe after its baked, I might put some things in there I made and baked a couple years back! Wow! The possibilities with my clay just got endless!!! And if I got some sand! I'm excited with ideas!!! Can you send me pics of your clay stuff in your tank(s)?