Hi - I do quite a lot of these type parties and I tend to offer a slick of nail polish (takes 2 mins to apply) a temporary tattoo each (I;ve got punky ones and some that lok quite glamorous) and full make up all for £10 a head. With the full make up I do pop on a flurry of mineral powder (some girls this age already have teen spots etc), concealer if required, eyeshadow, blusher and I mix them up a little lipstick / gloss combo. I do also give them a slick of mascara but I usually forego the eyeliner unless they want a flick out. For the eyeshadow I have a brilliant pallete from Urban Decay with great bright colours in it. I let the girls choose what colours they want to go with then I create a wee look for them. Al the girls I have made up at this age have definitely been looking for a bit more than glittery shadow and lipgloss - they are more discerning than I thought when I started doing these parties.
Hope this helps,
Sharon xx