Here's my Nebel's Rainbow just starting up. This one seems a bit more finicky for me to overwinter. It's had black tip, but not as bad as the Intense Rainbow.
Nebel's Rainbow aka Lei Rainbow.
Here are few more:
Kimo, showing variations with flower age:
Jeannie Moragne, JR. doesn't seem to hold up to our heat. Flowers don't last very long. I probably need to give it mor shade. Very tall grower, and not a great bloomer for me in pot culture. Still, the colors grab your attention when it decides to bloom.