Something with a white bottom works best in most situations but if the water is really clear then something with a translucent bottom works better. The only color that matters on a topwater is the bottom.
And yes, they seem to perform best in a slight chop on the water. If it's calm, I throw the smaller size (I think it's the 90) Whopper Plopper.
"If people concentrated on the really important things in life, there'd be a shortage of fishing poles." - Doug Larson