Cocoa beans are relatively hard to obtain, and brown sheep are rare, so here's a new way I thought of to get brown wool. You hold white wool, and you break a dirt block with it, then the wool turns brown, because the dirt would collect in the wool.
Thus, destroying the point of a rare item. You should never ever EVER make a suggestion that allows you to obtain rare items easily. For one thing, the "iConomy" server mod can give you good things in exchange for rare items.
I suppose Lapis Lazuli would be useful if you could dip white wool in water to make it blue. I don't like this idea, Cocoa Beans would be of no use except for Cookies. Plus, it would be easy to make big brown sculptures with this. AND, the dirt block would be infinite, so you could just keep on coloring wool until you have a whole chest full of brown wool. No, just no.
I don't get why cocco beans are so rare. The only thing useful they make is cookies, and brown wool but brown isn't even that appealing of a color. ****'s brown but you don't see notch hiding that in treasure chests.
If you like waffles, then you must like turtles.