short hair----extensions?

I have short hair, like halfway down my neck, and since i CANNOT think of anything to do with it (i don`t want to twist it back in little clips and this seems to be my only option), i was considering getting extensions for my prom...does anyone have any idea if this is really bad for my hair?? should i do it?? also, if anybody had any other ideas what to do with my hair, please let me know!!!