Two Background images?

Is it possible to have two background images?
What I am doing right now is I have a sigle, medium sized image that I have centered “no repeat” and I have set a Background Color. So any area outside of the centered image, shows the solid color I have chosen in “Background Color”.

What I would like to do is to choose another image to repeat, instead of just the solid color of “Background Color” and by still being able to specify “centered” for my first image, it will be centered no matter what screen resolutin people visit my site in.

Theme I am using right now is twentyten, but willing to try something else if it will work better.