I couldn't find a way to make text color gradiant in dzen. I wanted it to span over all text, not icons, so I made a small script that will do just this.
I figured I might as well share it in case some one else would find it useful (well, hardly useful, but we all love eye candy, right).
Usage is very simple. Just pipe output from conky through script and then to dzen like so:
conky | gradient FF0000 0000FF | dzen ...
and the result would look something like:
or a more sensible gradient:
You can find the code at my GitHub account.