Have used all sorts as well - of the commercially available ones the Exo-Terra "cave rocks" hides are my fave in the aesthetics category:



In the budget category, plastic planters flipped upside down with a door cut out rule.**

I have said "feck wood!" and tossed all the cute lil hollow half-logs etc. Too easy for stuff to grow in them and bacteria can get in that porous stuff - soaking it in bleach solution to counter that and you'll need loads of time for the thing to dry adequately and never be sure you got it rinsed thoroughly enough.

** And although I dont have a pic of them handy I employ these a lot more heavily than the looks-pretty-but-costs-like-it hides.