Spawn painted hats?

Is there a way to spawn the painted hats from TF2?

I tried the 'ent_fire !picker skin #" command and that doesn’t work.

I’m assuming it’s possible because somebody made this: http://wiki.teamfortress.com/wiki/Wiki_Cap . I know they could have used an image editing software, but it’s worth asking.

They mostly use vertex colouring on the hats, which I don’t think Gmod supports at this moment.
(mostly likely AO layer with multiplied colours over it)

No, they’re simply using an alpha mask to determine what parts of the material they have to colour.