From the top of my head I'd say stay away from pine and cedar woods or anything scented. You'd generally want to avoid anything that's porous unless you are able to seal it. Nothing adhesive like tape because they are prone to peeling and getting stuck on reptiles with potentially fatal injuries.
That's all I can think of right now and I know I'm forgetting a bunch of others (ah sorry!), but looking for materials that are mold, heat and water resistant (and waterproof if you can) would be ideal, providing they are low voc/non-toxic of course. Definitely research prior!