Members of the American Rhododendron Society get lots of requests like this. They have put together a list of proven performers in areas all over the US where they have chapters. Here is a link that might be useful: Proven Performers Lists

A creamy yellow evergreen azalea does exist in the form of "Green Glow", The flowers have a hint of pale green. ((Eric Schaeme x Glacier) x Anna Kehr) (Roslyn)

Katrina1 asked "Do you know when is the best time to spray or dust for bloom fungal disease? This spring my 'Red Ruffles' massive bloom burst was cut short by a fungal attack on the blooms." This is called Ovulina Pedal Blight. It is characterized by flowers that exhibit small spots which enlarge rapidly and appear water-soaked. The flowers turn brown and wilt. They remain on the plant. Some fungicides provide control if applied when or just before flower buds open. The best fungicides are a combination of chlorothalonil and benomyl or Mancozeb or Bayleton or triadimefon. During moist seasons, control may be difficult for late blooming varieties. Sanitation practices such as deadheading and removal of diseased material my improve control. In the northwestern US, Ovulinia is present, but similar symptoms can also be caused by Botrytis cinerea which is less damaging to the flowers and easier to control. Here is a link that might be useful: Ovulina Petal Blight

Thanks so much for your comments. I got a "Karen" azalea today and it's already in. The color is more pinkish but I realized that I already have a lot of purple in that area. It also is supposed to be pretty hardy. I didn't realize until I did more reading that azaleas are rhododendrons. If I can keep it happy, I may have to add more varieties to my yard--once I started looking I really became taken with how many of them grow in an Asian garden kind of shape. I'm going to have to go ask my neighbor for pine needle for mulch even if they'll think I'm weird.