If you're like me, you're mainly into code. You like writing systems to solve problems that you have and you can do just enough UI design to be functional. You'd like for your projects to be prettier, but spending a ton of time on tweaking the positioning and color of elements is not your idea of a good day.
Helpful Hint: Theme Forest
Hundreds of nicely layed out UI skins that you can buy pretty cheap and use for your pet project. I don't need to say much more about it, just go check it out (This is not an affiliate link, I have no finiancial reason to want you to go buy a template from these guys, I just have bought a couple in the last few weeks and am plenty happy with them).