One thing I've been wanting to do is color-code the tabs on Blender's toolshelf, either with an existing addon somewhere, or by myself in Python. There are so many great addons going on the T-panel that I can't read what's on the tabs anymore.
Ideally putting an icon on a tab, or at the very least making each a different color, would help a lot. If there isn't an addon, can I do within Blender's Python?
My knowledge of Blender's Python API isn't great but is improving. I'd definitely make this a goal but I'd like to know first if it's even possible.