low priority: users who duplicate a sprite expect the costume color to be just as flexible as in the original. But it is not, because the new one inherits the color state at the copy moment, rather than inheriting the original white color. We should have it inherit the original color (white or otherwise).

[eglash]

that would also solve another problem: currently we have no way of allowing users to revert to the original colors (white or otherwise)--now they can copy the sprite, obtain the original colors, and export that as a costume back into the original script.