Make-up goody bag - MAC/Chanel
Something starsign related
Perfume
Day out treat - spa day, girly lunch etc
Clothes vouchers
Something personal - photo frame with them in or them + their partner, silk heart personalised with message
What do they like? Chocolate? How about a chocolate hamper from Hotel Chocolat? Drinker? Minatures set or hipflash.
John Lewis also do amazing funky painted martini glasses - you could also personalise / decorate them yourself with gems etc
Getting married on 3rd September 2011 in a beautiful castle!