Unordered and vague ideas:

* manipulation of the userinfo page - find where it is located and how the interests and so on are printed, then manipulating by changing he order of things / icons etc - example for bugs that used this: http://bugs.dwscoalition.org/show_bug.cgi?id=743 http://bugs.dwscoalition.org/show_bug.cgi?id=763

* manipulation of siteschemes / layouts for basic CSS - change colors and margins - for example the change in Transmog margin width a few weeks back http://bugs.dwscoalition.org/show_bug.cgi?id=1311 http://bugs.dwscoalition.org/show_bug.cgi?id=1345

* anything that needs some play with the entry and user objects, since these are used a lot

Might be going through the resolved + effort-minor list in a few days :)