I did have several really nice diploid seedlings out of Mayor Of Munchkinland crossed with Halloween Green. Some resembled each parent, and some are an improvement on them.
I am using Malibu Sunset, Yellow Satellite, Pastel Explosion, and Sour Puss just to name a few, but of course, Rose F. Kennedy is a popular one, with Emerald Starburst as a close second. I have had some seedlings out of Heavenly Angel Ice that were better than it was. I have several plants that were out of Lavender Blue Baby- but they were not my crosses. Same for Stargate Portal....
The Kaleidoscope plants from the Carpenters have given me some very nice seedlings, but those original plants were totally not productive here, even though some were supposed to be dormant. The seedlings, however, seem to be extra nice.