A few weeks ago I took part in Bill Perkin's Color Boot Camp workshop. It was an intense 3 days of basically nonstop painting and learning. I think I retained about .08% of what he was teaching but it was definitely worth the time and money. Above is a composite image of the more than 19 color studies we did at a size which I'm fairly comfortable they be viewed in. Even so, don't look too close and keep in mind that these were mostly all done in 40 minutes or less and intended as fast color studies, not finished pieces.