At some time in your career, you’ll probably need to create an icon for your application, a button, or perhaps a menu item. One place that is often overlooked is all of the *Dings fonts such as Wingdings, Wingdings 2, Wingdings 3, and Webdings. Consider them to be a lot of vector graphics that you don’t have to pay extra for. Any graphics program that supports text (like my favorite, paint.net) will already support them.
While they might not stand on their own to fit your particular need, they’re really good for composition with other primitive images.