The images from the "special folders" (Music, Video, Picture) are stored in the "shellstyle.dll" of the Visual-Style you use, maybe:
c:\windows\ressoruces\vista\shell\shellstyle.dll (it`s always in the shell-folder)
You can edit the BMP`s with Reshacker and a graphic-tool, or more easy:
You can use other Visual-Styles, VS are here, here or here.
Read this tutorial to change your VS
Next time when you install a bricopack disable Moviemaker, choose personalized install:
