I often use gluten free white flour (available as plain or self raising. You can also buy gluten free baking powder). This is simply because a few of my friend's suffer with Coeliac's disease, and I feel bad when they get left out and everyone else is having cake etc.
I often get told on market stalls that people don't cater enough for Coeliacs, so I always make a gluten free batch of cupcakes, cookies and shortbread and keep them in tubs under the counter (Like contraband, haha!) ready for the inevitable question "You don't have any gluten free by any chance?". People never expect that I've decorated about 30 cupcakes with 10 or so different designs.. especially as children with the disease won't understand why their friends can have the colourful cakes and they're stuck with a 'special' biscuit with no decoration.. :/
I always try to cater for everyone and gluten free self raising flour has to be my best find yet; seeing little children's faces light up because they've never been allowed a cupcake before..