I like the idea of a "sprinkle"! And Jennifer I agree that it shouldn't matter at all. My sister mentioned it a while ago because she organised my shower for Izzy, so I'm just waiting for her to bring it up again and I'll have an idea in my head of what to do. Different groups of friends sounds ok, but even with just a few MG girls, I don't have that many girlfriends so it would definately be a similar grouping of people.
Thanks for the suggestions ladies!