On most computers today the best background sizes are.
1. 1920 X 1080
2. 1920 X 1200
My own preference leans towards darker backgrounds so my screen icons are not to hard to find because of an over busy bright colored BG. I normally keep most of my screen icons on the left side, so I keep that in mind when looking for great BG's. However post whatever you personally like. An example of what I like is below.
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