Awesome! I've been working on my abstract map for off-and-on about a month, now. So, I have quite the leg-up on this one. Since the pack is now officially announced, i'll post some screenshots of what I got. Unlike my usual nature, i'm not going to show or talk about any secret stuff. I will, however, give a hint on how i'll implement them: think "blahhh".
Okay, screenshot time! This isn't from my most recent compile, so a few rooms I have recently added will be absent. Click for bigger version.
de_absurdity

CT Spawn. Purple cliffs, red grass and trees growing out of the road and building? Crazy, I say!

Bombsite A. Those Terrorist scum have discovered a cache of the dreaded RickRoll virus, and plan on releasing it to the universe!

Bombsite B. Those evil Terrorists want to blow up the priceless abstract artworks that are unexplainably responsible for keeping the entire dimension in check. So like, stop them from exploding!

A tree growing inside of a house with black and white textures? The hell, you say!

Crazy skulls orbiting the other skull. Hard to capture in a 2D image.

This room was a last-minute idea, as I was desperate to think up a room to put there, since all my other ideas sucked.

Showing some love for Audiosurf.
And finally, i'm sure this room will look familiar to at least one of you:

T Spawn. Every custom texture re-created entirely by me in photoshop, except for the "dancefloor".
I've been having some net problems, which prevented me from logging in to Steam, so I couldn't work on it this weekend. It's fixed now, so i'll squeeze in a couple hours of work before I head off to class tonight.
There used to be a signature here, but it's gone now.