Calls come in alot of colors and they are cute ducks but not very good layers and they are loud. They are a good choice if you want ornamental ducks and you don't have close neighbors.
We have Australian Spotted ducks and they come in three basic colors, depending on the drake's head color, but the background colors have alot of variety within the three basic color types.  They are slightly larger than Calls and they are the best layers of the bantam breeds.
We had Runners once and they were too hyper for me.  They do have an unusual look that some people like but I prefer a duck that looks like a duck.  Runner crosses look like they are put together wrong and finding pure Runners is difficult and expensive.
Many duck breeds have standard colors so you will not get alot of colors that way.  In breeds that have lots of colors, mixing some colors can give you standard colors but other colors will end up mixed so you need to know about color breeding if you plan to keep hens and drakes.  The majority of duck breeds are only in one standard color.  The Australian Spotted ducks can be color bred like BBS chickens.