Heh. I just took your avatar for my X pointer in Linux :-)
jpegtopnm 795.jpg | ppmtopgm | pgmtopbm | pbmtoxbm >matt.pointer
cp matt.pointer matt.mask
bitmap matt.mask (hit "set" and "file->save", "file->quit")
xsetroot -cursor matt.pointer matt.mask
voila.
Too bad applications and window managers override it, so it's only when the pointer is on the background :-)
But she's still a gorgeous babe even in black/white..