I say we can come up with better colors than that, and I challenge you guys to prove me right.
So what new colors can you think up that would be better than Dimensional? I know, I know, it's a bar low enough to trip over; but let's brainstorm anyway.
My ideas:
Bring back the Stone paintbrush, and add paint brush items that customize the pet as a statue of some kind--for example, a water-spraying Flotsam fountain.
We have Gray. What about a color that will put your pet into an angry battle pose?
A Superhero paint brush.
A paint brush that poses your pet fast asleep, and gives you pajamas as custom items.
Eeeeevil paint brush!
Futuristic/Space-themed paint brush.
Cyborg paint brush (for those pets who don't get lucky enough to be zapped Robot).