Eightenth birthday party suggestions?!

lots of ideas here:
http://funteenpartyideas.com/

Try theming your party, but something not too hard, like fluro, vinnies party (or op shops, secondhand shops - have been to a couple and they were awesome!), a one colour themed party eg white, blue, pink which can also be hilarious. Wiis are fun at parties as well, when you use multi player games eg tennis. Need more information as to what sort of suggestions you are after though to answer your question properly :)

Well one way is to go out in town and get sloshed with all your mates.. or have a load of mates round and get sloshed.. or for something a little more civilised, book a meal in a nice restaurant for yourself and your best friends.. maybe go shopping for something to wear beforehand.. gets nails, hair, makeup done together..

My parents let me have a 16th birthday party in their house.. after that though there will be no more parties in that house!

You should have an 18th birthday themed part. Have goodie bags full of things an 18-year old can buy (cigars, pepper spray, that new 5-energy drink, etc). It'd be funny and clever. Just a thought...