Here are a few exercises I ganked from Paperback Writer a while back.
1. Write a classified ad selling your novel.
Urban fantasy with a twist:
Heroic trolls, elvish bad guys, scent driven insights.
Theme of wanting to belong, mixed with horror and humor.
100,000 words or best offer.
2. Make up a motto based on your novel theme.
Keep your scent.
3. Describe your novel in 15 words or less.
A troll with a nose for magic finds trouble when she becomes...a tooth fairy. (Wow! 15 exactly!)
4. Write a personal ad for your hero or heroine.
SCTW(Single Cafe Troll Wife) Seeks companionship leading to something more.
Likes: libraries, ancient mysteries and knot language.
Dislikes: stalker monsters, elves, marshmallow scented faeish.
Compatible scent a must. Name not required.
Kind of fun, but they need more work.