Starry Wallpapers for iMac


I recently upgraded to a 21.5 iMac, and I'm looking for a suitable wallpaper for it. Specifically, I'm looking for a black and white picture of a galaxy, but all my searches on Google only showed images that are too small for the iMac. Any suggestions? Thanks in advance, Sparrowhawk
You are aware I hope, that under "Change desktop wallpaper" there is a drop down menu that gives you several choices as to resizing the pictures.
Addendum: I found the "change" option you spoke of but the image is just distorted because there aren't enough pixels, I imagine. Solutions?
I found a wallpaper site called "WALLPAPERS WIDE" that contained a variety of large format wallpapers, including space pictures. We can close this thread now.