If your birthday is in the summer then you could have a garden party, set up a marquee where people can dance and play loud music, have a barbeque (with veg kebabs for the veggietarians), you could set up a volleyball/tennis net, have a basketball hoop. In the marquee you could have half of it filled with bean bags and stuff. And on the patio (if you have one) have tables and chairs. People can chat, play sports, dance, eat .... etc.
You could also do a theme, maybe of your fave tv show (big brother is a good one, i have done it and we made our very own diary room with camcorder and put BB eyes around the house), a-list (dress up as a celeb), hawaiian, cavemen (well cool, you can all wear furry skirts and boots!) and tons more.
You could have a disco, ask your mates if they have disco balls and put them on the side/hung from ceiling. You can also get other types of flashing lights and serve people cocktail-style drinks but with no alcohol (or with alcohol if your older). If you do decide to have a disco then its good to let the boys have breakdancing competitions and play limbo!
Hope i helped,
*+*TropicalBabe*+* &hearts
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