RGB/HSV LED transitions... any suggestions for good ones?

Hi all, brand new user here and I'm having lots of fun using an Arduino Micro to control one of the Ikea Dioder strips (basically just cheap LED strips that, with some minor hacking, can be controlled w/ the Arduino).

My present setup transitions through RGB space based on what's playing on my TV, and I'd like to expand this by being able to choose from different RGB transition programs. Does anyone know a place where people share their RGB transition algorithms?

I know this probably borders on color theory and psychology, but it'd be cool to be able to select RGB transitions based e.g. what kind of mood I'm in, time of day, etc. and just not sure where to start now that I have the hardware up and running.