No problem This doesn't have much to do with wallpapers, but someone at work had a color sucker (I guess that's what he called it) and calibrated my Macbook's monitor for me. It worked wonders, and I recommend it to anyone if you're picky about your color settings.
You mean a monitor calibrator? At over $100, they aren't really practical for the average user to buy to set up one monitor. If you're a graphics pro or technician, sure.