I've made the source code of 3D User Pic available for free, so no secrets here
. 3D User Pic simply moves the user picture "frame" (window) by loading a piece of code into explorer.exe at runtime. That piece of code actually moves the user picture frame at runtime.
I have no idea if it is possible to move the user picture by modifying properties in the MsStyles file - I think MS programmers coded it to be centered with respect to the places list. Although, the RECT property might have some influence here.