Sleepovers; Nail polish (lots of paper towels in case of spills), hot rollers/curlers and hair accessories to try out new hairdos, maybe even straighteners and hair spray. Home made lotions and potions and face masks
http://beauty.about.com/od/skinflaws/a/facemas ks.htm , cucumber slices for covering your eyes and spa supplies - see above link.
Games include one guest stepping out of the room, all the girls hide inside different sleeping bags, then the person has to re-enter the room and figure out which guests are in which sleeping bags. Push the bags closer together to make it more difficult. You can also play "where's my papa" where one girl also leaves the room, the others find a spot in the room and close their eyes tightly. When they are ready, the girl re-enters the room as quietly as possible, and someone has to yell Where's my papa, if they hear the person make a sound. Bit like blind mans buff?
For invitations, use felt and attach a sheet of note paper as your invitation inside. Roll the felt up like a sleeping bag and tie it with embroidery thread as a cute invitation.
Try to get mini marshmallows in another persons mouth - the one with the most on target wins