That "spot" concept on pannie baits is a good one. Years and years ago I had some plastic baits that had a single large drop of color on another color, a different body and no legs with a split tail, that was a dynamite bluegill bait. Purple with a white spot like this comes to mind as being a really hot color.
Good stuff DF.
I had my Mayfly mold out the other day to whip up some more natural colors that got tapped big time last fall.