EDIT - Did a revamp of the Green Screwdriver cos it was a bit buggy
As if this hasn't been done enough already... just thought i'd have a go myself
They are by no means perfect but we have:
Eleven's green sonic screwdriver (with variations for "working" and "help select" for windows)
Nine/Ten's blue sonic screwdriver (again with variations for "working" and "help select" for windows)
The new style tardis for "link select" in windows...
a glowy blue rendition of the seal of rassilon for "busy" (whats usually a little hourglass in windows)
These work fine with XP and 7. Hit "Download" to get them but if your not sure how to use them on your OS then search google (for windows usually under "mouse -> pointers" in the control panel but to get them to stick in 7 (and possibly vista too) change them under "personalise"
and save your theme...) Just in case anyone wanted this sort of technical info... pointer "hotspots" are at the screwdriver tips and the middle of the light on the tardis - just incase anyone has trouble clicking on anything with these.... (i should mention that the "hotspot" on the green screwdriver is in a bit of a dodgy place due to the extendy nature of the screwdriver.... :/ )
If you want to personalise your desktop even further - check out my gallifreyan desktop-icon set here: [link]