This is a small theming utility that I wrote to help me come up with new color themes easier. Not sure if this will be of use to anyone, but I figured I would share it here. Basically, I found it too tedious to have to go through the scss compile process after selecting a new base color just to find out that the new theme doesn't look very nice. This utility will generate CSS on the fly based on the base color selected. This way you can see what your theme will look like when you compile your scss using that base color.
You can get the source and a more complete description here: http://code.google.com/p/extjs-sass-tool/
Unfortunately, I do not have a demo page set up, but hopefully these screenshot will give a good idea of how it works.
Yes, good job