Soooo... I get to paint anything I want on my wall.

[PTSpyder]

A GIENT PEENUS HURR HURR HURR.

Beat me too it. My idea would have been ball sac...

 

[The Infinite]

Paint it back and draw on it with chalk.

Seriously this, since you can draw whatever you want after and if you don't like what's on the wall just erase it and draw something else.

 

[Disaster Button]

You could paint it black and draw a star in the centre and then paint on objects or symbols you're close too orbiting the star.

Or maybe just paint it white and add loads of little cracks and paint a few holes on that make it look like Narnia is on the other side.

 

[Shepard's Shadow]

Spoiler: This

I'm not a big Half-Life fan, but I have to agree with you. That would be awesome.

 

[Nickolai77]

Just paint a wall full of awesome nerdish-ness, that seems to be the impression i'm getting here.

 

[WeAreHeros]

A deep scrub with a sniper in a Ghillie Suit .

 

[rabidmidget]

How about BIG BROTHER IS WATCHING YOU!

 

[Brownie101]

You should totally paint an Aperture Science Portal on it with one of the Test Chambers in it.

That would be aweshum.

I'd go with this. It sounds awesome, and the enrichment center rooms shouldn't be that hard to draw.

This idea has my full support. In fact, My room needs a new coat of paint... perhaps I'll paint one of the secret rooms!