Whatever you decide to do will of course come down to what you find the most appealing. With that said, I’d suggest painting one wall with photography in mind, whether it is going with an accent color you want to use as a backdrop, or basic white for light bounce. One thing I hated having in one of my first reptile rooms was carpet. Made a mess that would be easy to sweep up far more labor intensive to clean. Plus it holds smells if you end up with a leaky cage, or a tub spill. Installing outlets at the right level is also important, along with plenty of good lighting.
Regardless of what you decide to do, just make sure it is a place you’ll enjoy being in.