ChickenPaint 2 has now been updated with professionally-designed toolbar icons by @Anteira to replace the random mixture of icons and text we had before.
These are the new icons:
Compared to the old set:
If you still want to use the old icons you can switch back from the Palettes menu:
I've also added keyboard shortcuts for the pen (B) and pencil (N), and I'm keen to hear what other shortcuts people would like to have added!