on the fly Painting tool

Could it be possible to include an on the fly painting tool in gmod? if we could create some square of overlay, just like spraying but ingame?

Let’s say you could choose the size of the square, then create an image in a paint style tool inside the game. We could make graffiti or write the name of our ship on the side.

Include some props protection that admins could activate or not.

[editline]20th January 2011[/editline]

You know the paint tool inside Track mania forever? that is THE Sh**

Maybe get a video of the editor with the painttool?

this is an amazing ingame feature,but anything would be welcome