Appropriately treated driftwood will be fine for a tank when it comes to aesthetics, but ball pythons are terrestrial and not arboreal. They really prefer to stay on the ground and hidden. If there is the right heat, humidity, and hide in the enclosure you will not see them moving around much unless they are hungry. I would suggest investing in improving the husbandry of the enclosure before moving to aesthetics and driftwood. Other than that, have fun! I used to have an enclosure with a pair of impala horns in it for the shock factor hahaha