You could follow Becks' fashion and plait your hair. How about making a ballgown out of bin liners or going for the tin foil look (like Girls Aloud on their album cover)?
If you've got time on your hands, you could watch all five Star Wars films back-to-back.
If you get hungry, you could bake a cake - but add some fab food colours to the recipe. Anyone for a slice of blue banana cake?
If you're feeling daring you could dress up like Marilyn Manson - or Christina Aguilera - and scare the neighbours.
If you're feeling really daring, go to a theme park - the queues will be shorter because loads of people will be out buying OOTP.
If gentler pursuits are your thing, you could learn the names of every member of Blazin' Squad, So Solid and S Club 8.
So now there's no excuse for avoiding Pottermania.
And remember, if you get really desperate, you could remove every fluff ball from your school jumper - or count the spots on a Dalmatian!