So, I am replacing one of my BP racks with a custom-made one and will have this one free and want some ideas for it.

It's black plastic, 4-high, and holds Sterilite 1756 tubs. The problem I've been having with it is that it has a single row of 11" flexwatt down the back and that just doesn't really get it hot enough for balls. This winter I had to wrap it in blankets during the cold spells in order for it to keep the temps adequate and I'm glad to be replacing it.

However, as it still works fine (just not warm enough for balls), I'm wondering what I could put in it. Any suggestions? I prefer fun and inexpensive over high-dollar breed-for-profit things.

Also, the only herps I have experience with so far are ball pythons and my blood python, and I'd prefer something that is hardy or not terribly demanding, or at least has been well-researched and is easy to find care information on...I'm reasonably intelligent and detail-oriented, but would feel awful if some fragile little thing suffered because I missed an essential aspect of its care.