Help with smallish presents for teenage cousins

[PrincessCambridge]

Buying little presents for little ones is easy but could anyone help me with teenagers? I'm really stuck for ideas.

I am looking for 3 gifts around £10 each for a 15 and 14 year old girl and a nearly 12 year old boy.

What could I get them that they might have a chance of liking or at least not chuck straight in the bin?

Any ideas?

Primark vouchers, something with a 'label' ie superdry Beenie, makeup, onesies (if you can find any for £10 they seem to be 'in' still. Smellies still popular.
I got nephew a sweets hamper that went down really well- pound shop is your friend for that one.

Cinema vouchers
Pre loaded starbucks/Pret/Costa vouchers
Smellies
vouchers for shops
snack box of treats
I-tunes vouchers

How about going to boots and doing the 3 for 2 offer.
They have loads of things aimed at young teens.
Previously I have bought funky nail varnish sets, make up, posh hair care sets.
Not as much for boys, poss lynx set or wash bag, they usually have some silly things in there.

Ooooh fab ideas everyone. Many thanks!

Boots have the Kate Moss perfume for a tenner, for the 15 yr old maybe.

Superdrug have some really nice makeup by make up a academy (MUA) that's cheap but decent quality - £4 for eyeshadow palette, £1 lipstick, £1 glitter eyeliner. Barry M nail varnish is about £4 a bottle and is also popular with teenagers.