I'm sure there are online makers for userbars out there, but they're a pretty quick thing to make in photoshop if you're interested in toying around with creating them. They're 350px wide on standard, although depending on the person the height may vary (usually 20-30px though). So make a canvas that size, and then add whatever you want to it.
Depending on what it is you want, I could probably make you one if you're interested.