[Year's_End]

How about...

Tension - Images that depict tension in the form of creases and stretched sufaces. Cars are a cop-out idea. You could use stretched cloth, sculptural buildings (if you're lucky enough to have local ones around), etc.

Symmetry - Self-explanatory.

Textures - Close shots (prob macro shots) of textured surfaces that give you a great idea as to how they'd feel if you could brush your hand across them.

Stripes - Image must include stripes as an integral element. Could be a pic of an animal, clothing, buildings, street paint, etc.

I'm just throwin out ideas.