Well if by accesories you just mean hides, Anything thats within your budget and suitable would be fine. A piece of cork bark, small log etc.
If your looking for something to make the cage look nice, i guess its down to your own personal tastes. Any kind of ornament would work in there really, aslong as you make sure its safe to go in with the animal (Toxic paints etc.)
I guess it all comes down to what you want the tank to look like? Natural Habitat? Themed?