Yes. In fact, I had the urge of starting a community icon catalogue back at the summit, but RealLife interferred :-)
We need: common style for e.g. apps, actions mimetypes, status etc.
Suggested route: take a look at the tango desktop project and their icon theme. Merge with stock Nokia Icons (copyrights?). Improve.
(Personally, I don't like the tango icons - too much detail/noise overload, not iconic enough IMHO - but good overview of what is normally needed)