Justin, While this is not my subject at all, I can offer a few points from observation and what I learned from gifted breeders like Fred Meyer. There are "rules" in color inheritance and in what "color breaks" are likely or possible according to the color of the parent(s). For instance, it is not especially unusual to get a yellow "sport" or "morph" from a batch of seedlings of a plant that is typically orange- or red-flowered. This is called a color break, a clean break as it were from the original or typical color of the species. Examples include Crocosmia, Clivia, Tigridia pavonia, Mimulus, marigolds, etc. They often turn up as individuals rather than populations. A break to red or orange in a normally yellow-flowered plant seems to be much less common. Blue flowers can also break to yellow, as species in genera like Delphinium or Iris. Breaks from orange-red to blue-purple or the reverse are rare. The rules have to do with genes that control color obviously but they are often complex. What we interpret as "a color" may be two or more colors in different layers of tissues that give an overall monochromatic effect. So, if one layer can be bred out you get a different color result. Another example is breeding yellow flowers by "pulling out" the yellow color in the throat of an otherwise red flower by continuous breeding. What can occur naturally I think is largely a determinant in what can be done in breeding, but some pretty amazing things have been accomplished with embryo rescue and gene splicing. One might ask, rather than "Is it possible?" -- "Is it cost-effective?" Sorry to give you such an incomplete idea of this subject, I wish I knew more myself. Rest assured plant breeders know a LOT about this subject and much of it is written up in appropriate journals. Dylan Hannon