But here is a way to make your very own Rainbow Rose. We should probably label this "don't try this at home"
https://www.youtube.com/watch?...
When you get done laughing, your other question was: Do roses grow from seed? Yes, but as seed always re-introduces some genetic diversity and not necessary what you thought it was going to be. Roses don't need to be grafted either. Those of us from colder areas look for self-rooted roses because they can die to the grown and come back up whatever they were supposed to be. Grafted roses, on the other hand, will come back up whatever the rootstock was. The most common rootstalk around here is from an old rambler rose named “Dr. Huey.”
You can take cuttings from your grafted roses and grow your own self-rooted roses.
Daisy