Aside from being nice to look at, I pretty much consider two issues when choosing wallpaper:
1) Because I have a 1280 x 768 monitor, most wallpaper doesn't fill the desktop. Therefore I prefer a predominantly black or white wallpaper, so I can set the background to match and it will blend reasonably well. I can never match colors.
2) I keep my shortcuts on the left side of my desktop (standard for Windows), so I want the artistic focus of the wallpaper to be on the right, where it won't be covered up. If I were using a Mac, with shortcuts on the right, I would want it the other way.
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1) Because I have a 1280 x 768 monitor, most wallpaper doesn't fill the desktop. Therefore I prefer a predominantly black or white wallpaper, so I can set the background to match and it will blend reasonably well. I can never match colors.
2) I keep my shortcuts on the left side of my desktop (standard for Windows), so I want the artistic focus of the wallpaper to be on the right, where it won't be covered up. If I were using a Mac, with shortcuts on the right, I would want it the other way.