I have a suggestion that would make C2 a lot lot better.
The C2 image editor is fine but it lacks of functions.
It would be nice to see:
-Image Scaling by percentage (also could have a scale the entire project function)
-Hue/Saturation/Brigthness (that would make so much difference)
-Simple filter and effects like blur, glow, grayscale, etc.
-Fill/Fill+Outline/Outline for shapes
I don't know if it is possible to do, but it would be really nice for C2
Sometimes is a bit boring when you just need to tweak something in your sprites and you have to go to other software... With that it would be so much faster to change some things