Let me see if this helps (In terms of ideas). (From combinations that seem to work... (Or are 'supposed' to according to theory))
You can do Dark blue and bright yellow.
You can do dark blue, Purplish blue , a cyanish blue, and Yellow. (If you want).
Blue, purple, red.
Blue, Purple/Indigo, Orange
Dark blue, Cyan, Teal, and Red.
I've taken out color combinations that would need green.
As for my personal opinion of the fur colors:
You can use two and three on the face. And throw four into the ears, which might be fun, but A does look good too.
You can see for yourself about the theory I'm following: (I apologize for the size)