I wrote myself a test addon today.
Source:
http://code.google.com/p/rothui/sour...rTest/core.lua
The intention of the addon to try out the listed UI components above.
Button, Slider, Editbox and ScrollFrame were tested.
I'm going to add the colorPicker example and an example for the dropdown list in the next update.
*edit*
Added the colorpicker example.
http://code.google.com/p/rothui/sour...e.lua&old=1039