Look for an unusual one that is pink with blue and Potato Leaf. I got it out of a large population of F2's grown from a cross of P20 X PH large fruited. I also have a regular leaf pink with blue and a large fruited red with blue that runs about a pound.
Tom, Please note that the P20 blue you are working with carries 3 genes to get the darkest expression. They are atv, aft, and abg and are documented here:
http://jhered.oxfordjournals.org/cgi.../full/94/6/449
There is a problem getting abg to integrate with the other genes because of its location on chromosome 10.
Darrel Jones