Yup they can be white (albino), pink, striped black/gray (regular convict) black (which they call a blue convict it does have blue/purple translucent fins) There are all kinds of crosses pink/regular, or pink/black will give you a spotted con, a blue/regular will give you a light light grey with thin light colored stripes. A local pet store has a female that is almost completely orange (when she wants to breed which is 90% of the time) They breed so fast and successfully you can line breed quickly for any feature you want.
We had some reg/blue mixes that we breed about three lines and had some cons with very long translucent fins, however they like to nip each other so it was a win/loose situation.