For what kinds of menus? I tend to do my own; Paint.net does a pretty decent job of aping Photoshop for basic editing and transparency stuff, and flipping colors for state indications. Also has some fair plugin support for things like blur/shadow filters. Masks and edge manipulation, not so much, but hey, it also doesn't cost more than a year of game subscriptions and my car note. Then again, I do not pretensify myself as anything approaching having a professional title with "Graphic" or "Image" in it. Of course, if it's for your own use and not getting published, you can just find your favorite apps and copypasta the icons from those menus.