pologies in advance if it sounds like a silly idea, but what if the 

SVG->PNG conversion is done once a user sets a new icon theme?

one would only need a check to see if the proper PNG files are already 

there. That way the PNGs wouldn't need to be bundled at all, and the 

check could be done at startup to ensure there would be no bad surprises.

however, this approach wouldn't be suitable if direct SVG->PNG 

conversion is not desirable, as in the case of individual size tweaking...