Is there a way to provide icons for actions?

[sclough]

For example, the "compose" and "compress" actions on QS on my machine
now use the default quite box rather than the icons they used to use.
I'm not sure why the icons have disappeared (and I've tried re-
downloading and installing), but I'm wondering if anyone knows how and
where QS loads these icons from so that I could manually provide them
to the QS.app folder. I know it may seem trivial, but those white
boxes are really annoying me...