I've always wanted a bigger, fuller butt. People I've been with, when I've complained out it, have told me that I have a nice shape but it's true there's not much there.
My understanding is that exercise can't solve the problem of there being 'nothing' there because of how the fat of your body decides to distribute itself.
Surgery might be an interesting solution but I have a lot of personal issues with body modification. I don't want it to feel fake, if that makes sense.