You were asking about other themes right? Jesus, a ton of fuckers are just telling you what you already know--you're a good designer.
Themes:
1. Sci-FI. Design studio of Mars. Red planet. Green men.
2. Snow scene with animated fireplace and hot-bitch snow vixens
3. Jail. Never underestimate the selling power of prison. Animated homo rapes in prison blues. This will sell and impress your non-porn clients.
4. Inside the human body. Different organs. Animated white blood cells. You could even do some disease angles. Medical market is actually good money for illustrators.
5. Hawaiian pot farm. Fields of green. Hot rasta bitches smokin spliff.
6. Samurai Japan battlefield. Kurosawa tribute. Peasant mutilation.
7. Planet of Endor. Forest scenes. Ewok fellatio.
8. Volcano explosion. You live in Hawaii. Just take a hike with your digital cam.
9. Back of police car. Flashing red and blue--audio effect of siren and chaffing handcuffs. Animated piggies.
Alright, that's enough of the good ideas...you can thank me later.
