If wallpaper is what you are after, you can ask Google to find images exactly the same size as your monitor. Just replace the numbers with the proper pixel dimensions:
https://www.google.com/search?q=Albert+Bierstadt&safe=off&tbm=isch&tbs=isz:ex,iszw:2560,iszh:1600
It may help to use numbers that are a size or two up from your monitor, but in the same proportion.
Awesome thanks!