Color debate

I purchased the paint primer last night, but put off buying anything with color because I'm indecisive!

For the past few days I've been mudding the inside of the bathroom (I'm not very fast) with the intention of getting it ready to paint the first part of next week. I hope to use a couple of the lighter shades -for the smaller room- to get an idea of what some of these colors are going to look like; I never think the finished product is exactly the same as the color sample (I think it's just me).