Anarch,
You are only partly correct about breeding color horses. When breeding paint horses you should not breed two Overo pattern horses together as you run the risk of getting a Lethal White foal (which is fatal). Breeding two Tobiano pattern horses together is safe and is how you get a true homozygous Tobiano which is desired. You can also breed a Tobiano and Overo together and that is safe. While you run a small risk breeding an Overo to a Solid whether it is a breeding stock paint or a solid quarter horse. These horses can carry what is called the minimal white gene, which can produce in some cases a lethal white foal. Paint horse genetics are quite complicated and are still not fully understood.
Terri,
A good place to check out information is to go to the APHA website. But not knowing much about the horses it sound like you will have a good chance of getting a painted baby most of the time from your palomino paint mare and a 50/50% chance of getting a painted baby off of your grey mare. Your grey mare throws here own mix into things as that she has a good chance of making the foal she has a grey, since greys are a dominant color. Hope this helps.
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On the 6th Day GOD Created Quarter Horses on the 7th Day He Painted the Good Ones. 
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