Avatar sizes, and background colors

Quick question. I've noticed as most here probably have that some members avatars are larger than others, and some have a colored background. I'm still relatively new, and experimanted with different size originals when I posted my avatar, yet no matter what size original I used the outcome was always pretty much the same size when it posted. I also couldn't figure out how to put a colored background up.
Just curious.

You have to "buy" the coloured background in the ATS store.

This may or may not answer your avatar questions.

www.abovetopsecret.com...

The backgrounds are obtained from the member store, if you click on the member centre tab, just under the big banner at the top, there is a section called ATS store, you may need to click it.

There you will see a number of options that you can have. As you post you can ATS points and this is how you buy the additional features.

Thanks for the info!
I figured it was something simple, I just needed a helping hand.
Thanx again.