First a tiny disclaimer - being relatively new to the challenge arena I'm not entirely sure about what has been done and what hasn't so I may come up with some stuff that's already been done before without knowing it, so here goes -
-The Nine Tenth's Challenge
Possession being Nine tenth's of the law, design and paint up a motorized vehicle possessed by either a demon, a ghost or a strange alien entity, any kind of vehicle you like so long as it's clear what manner of strange beastie has taken possession of said vehicle.
-The Boldly Go Challenge
Boldly go where you haven't gone before and do some interior designing for an alien space craft - design and paint up one room on the alien ship Zuron, you could do a flight deck, a medical bay or detention cells just make it so number one.
- The Diabolical Villainy Challenge
This is your challenge should you choose to accept it - design and paint up a diabolical villain and his most trusted henchman and/or favorite pet, can be any type of villain - bond villain, comic book villain, or even a mix betwixt the two, or three or four it's entirely up to you Mr. Bond.
- The Stranger in a Strange Land Challenge
Imagine for a moment that you wake up and find yourself in a bustling city filled with fantastical creatures, people from strange lands and exotic looking stalls and storefronts selling all kinds of mysterious and arcane gear, right, now paint it.
- The Backwater Rumble Challenge
Start your engines - man-things and women-things of earth, you have been challenged to a race on a backwater alien planet, design and paint the kind of vehicle you'd need to win the race, think about what kind of technology, if any, would be available to you and what kind of terrain your vehicle might encounter, perhaps you're a bit of cheat in which case you should consider what kind of nasty surprises you could invent for your competition, it's only cheating if you get caught - right?
- The Identity Thief Challenge
Design a creature or a person using technology or magic to alter their appearance to look like somebody else, the object here is not only to create a believable character design but to also imply exactly what the character is capable of doing, how you choose to do so is entirely up to you.