Animated GMod BG's?

I was wondering if it is possible to create an animated GMod background.

Yes, but only through layered vtfs and material proxies.
I was thinking of attempting this about a week ago.

It won’t work if you try to make it like it is in HL2.
Those are maps that are loaded on startup. It would never work in Garry’s Mod.

Edit:

Well it would, but you’d be loading for ages…

Or depending on how many addons you have installed.

I wasn’t thinking about doing the thing in HL2. I just wanted to make some abstract waves in After Effects or something.

Oh, then yes. Thats pretty easy to do.
I still need to test it out.

Edit:

Just tested it, works flawlessly.

Cool