Okay, I guess I'd reccomend this for teenagers, cuz I dont think anyone under 13 would be interested. If you like scary movies, etc. you could consider having a goth/punk party. If you're doing goth, get black colored hair gel, like ICE Spiker Colors, and if you're doing punk, get a bunch of colors. I've noticed some especially popular punk colors are green and blue for guys and purple, pink, or a mix of pink and black for girls. WARNING: With this gel, don't try to tip your hair or anything; do twists, streaks, or if the hair's short enough, possibly spiking. (5" or less; you want everyone to be able to get through  the doorway by the end) If you're really motivated, you can try a mohawk or something. Also you can do different things if the hairs pulled back, twisted back, etc. On the invitations, for goth, have old english lettering, and have the colors mostly red/black or purple/black. For punk, put safety pins on it, and letter it with random fonts. Again, if you're really motivated, cut out the letters from a magazine or newspaper. Ask everyone to dress goth/punk, depending on the theme. For party favors for goth, you might get costume fishnet stockings(i've seen very many goths wearing these), an evanescence sticker(they're not a bad influence or anything, as many people come to believe goths are. I dont believe Marilyn Manson is either, but that's another topic, another day), etc. Also go to hottopic.com for goth or punk and look at some of the stuff there. Most of it you can get at cheaper stores, i've seen some at target, even. For punk party favors, get clothespins, buttons with random sayings (kindergarten frolics, whatever :D)(they have these at hottopic.com for about $1.50 each, the only things I can actually afford.... Right now I have one with happy bunny on it that says "have a great day you worthless turd" hehe), and put them in a plaid-print or black bag. I did this one year when I was 14 and my friends and I had a lot of fun, because it was our night to be completely different from how we usually are without being judged for it, or having to talk to the counselor about depression (some kids had to do that even though they're pretty much bouncing off the walls lol) So, anyway, if you love this idea, COOL! If you don't, well, sorry buddy. ^_^   By the way, the best Happy Bunny quote is "you suck and that's sad"... hehe