Help for the Overcolored

So, I'm not the best visualizer when I comes to color combinations and tend to play it safe. I'm am also easily overwhelmed by all the different colors of yarn when I go to the LYS and have problems deciding what colors to buy. I just saw this post at Craftzine about this website at Adobe which allows you to try out color combinations without the commitment of buying stuff at the store. Things are easier for me if I can distill it all to the color wheel.