What are your interests ... hobbies, favorite music or movies, sports, etc.? That's a great place to start. Also, is this a boy, girl, or a boy/girl party? Is a sleepover involved?
You can also check out my Themes at my website ... www.1Party2Go.com. You might find an idea there or something may inspire another idea!
I can send you any theme plans from the list on my site. Or we can come up with something new from an idea you might have. Let me know! Happy Party Planning!