Joint Birthday Party Ideas?

My sister and I are going to have a joint birthday. She's turning 14 and I'm turning 16. We simply can't afford to have two birthdays so we decided we'll just invite a bunch of our friends and hang out. We know we want pizza for it, but we can't decide whether to have it at Cici's or just order in and have it at our house. Keep in mind, we really don't have much of a budget.

We can get our mom to pay for pizza and that's about it. We need suggestions on where and just other ideas to make the party more fun. Also keep in mind, all our friends, including ourselves, are a bunch of skaters and emos. So no "sweet sixteen" girly girl ideas please. Thanks.

By chromej160