Keep it simple. When we were a less experienced team we had a large pit structure made from PVC with black and blue sheets draped from the sides. While it did make us more visible most of the time it was just a nuisance making things dark and cramped. We also used a large led lit cart for transporting our robot to the field and while it was nice looking it took up more space than necessary.
For champs this year we started from scratch and purchased a
tool chest that could securely hold all our gear for transportation and includes a power strip on the side to save some precious table space. Instead of a bulky robot cart we bought a
17$ movers dolly and
a handle which could be easily folded and put away when not needed. The dolly also helped a ton when we had to move the pit closer to the field during elims. To raise the robot form the floor we just used a clam shell container which could double as storage. It may not of been "cool" but it was easily the most effective pit I've ever been part of.
A great example of a
simple and effective pit is 1114's.