How to edit materials in any source game.

Step 7: Update

I've found that the free and ever so lovely image editor paint.NET can be used to edit VTFs directly, making VTFedit somewhat obsolete.

For this to work, however, you need to download a VTF plugin for paint.NET, which can be found here.
Also, paint.NET can be found here.

Man. Things are so easy nowadays, there's barely any fun to it!

Anyways, happy smurfing!