Here a quick thought of insanity before I leave the office at ~1.05am. I dwell and fret over design, particularly when its me making the decision, to the point of insanity (a recurring theme here).
If I have a base color, I use Adobe's Kuler to get matching colors (with some rule depending) or I checkout ColourLovers to use a platte crafted by someone with a keener eye than I. Similarly I use a typography calculator to define font sizes relative to each other and so on, so on. I have a whole bunch of these rules and methods I use so I can sleep easier knowing there is method behind my design choices.
Heres one I came up against just there, I wanted to put in a nice gradient as background in something I'm building at the moment, like anyone else who is a regular connoisseur of GitHub's trending repos, I stumbled across uiGradients ([Repo](https://git