I love using driftwood for snakes too- but just a caution- if there are ANY holes big enough that he can get part-way into, you should plug them up* so he doesn't get stuck trying to go through- snakes don't always know any better. If they do, it's very dangerous & difficult to extricate them safely & without injury, because their directional scales prevent them from backing up.
In the wild, they sometimes get stuck & die in things like "bird netting", while in captivity, it's sometimes happens with poorly-chosen "furnishings", like the holes in those "skulls" or other things that may look "cool" but are designed for tropical fish. In addition, I've found that since tropical fish do not snug themselves into cave-like spaces, many of these things (for fish) may also have razor-sharp edges left inside, & a snake can get seriously cut up accidentally.
*Corks match driftwood pretty well- I've used a cork, glued in with reptile-safe silicone sealant (designed for aquariums), but it depends on the size of the hole- even a piece of wood can be used.
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