Here is the first image.  I took it at a really high iso to let in the orangish ambient light.  BTW all images are ETTL with a stofen omnibounce on a 580exII.  It is mostly to prove a point, though I’m sure you’ve had images at some point where you’ll say “damn that background is really orange.”

Next I took an image to show Jost what kind of background I like to get.  Notice how nice and white the walls and blinds are, though Brian is looking a little blue in the face.

So here I’ve slapped a Color Temperature Orange Gel (CTO) onto my 580ex.  I took this to show how I’ve effectively changed the light in my flash to match the color temperature of the room.

All we need to do now is tell the camera that orange light is actually white (Kelvin set to 3000K) and now we have the ideal exposure.

Yeah, seeing them side by side makes a big difference.  I love having good white balancing, since I’m always shooting JPEG.  But this applies to you RAW shooters out there too.  Imagine, the RAW file only has the first two images as options.