I Have a Cow Problem

I started this week with Rose, outlined in black and filled in with many colors. I liked her so much that I thought I should make a Michigan State cow, outlined in green with other green highlights and named Sally. And finally, around here, if you have a MSU cow, you also have to have a University of Michigan cow. Maude is framed in blue with yellow and blue highlights.

In just one week's time,
I created Sally, Rose, and Mabel.
Give me one more week...
and there might be a 4th on the table.