The original roots of Mirabilis jalapa/Marvel of Peru/4 o'clocks came from Vesey's Bulbs and the blooms come in different colours. I've saved the seed from each colour and have dark pink, light pink, white, yellow and a mixed yellow/dark pink.
They are packaged in 10's of the same colour. If you are interested in having some please let me know. I will do a swap if you have something I want or I will do SASE.
I'm including a link to my site so you can see photos of the plants and seed.

Here is a link that might be useful: 4 o'clocks