Unusual Homozygous Tobiano Patterns

I have a miniature horse stallion, and now several mares that have an unusual homozygous tobiano pattern. None have any appaloosa in their pedigrees. I suspect sabino and in some cases splashed white. So far these horses have all come from horses that did not look like their parents and they have only occaisionally reproduced themselves. [color=#FF0000]This is the stallion Jazz. He is TT, LWO Neg, Ee, Sb1 Neg.[/color] [img]http://pacificpintos.com/referencesires/images/jazz1.jpg[/img] Here are a few of the mares: [color=#FF0000] Lakota Stars: TT, LWO Neg, Red Factor and Sabino ?? [/color] (She has not been tested yet. We are waiting for her arrival which has been delayed by snow road closures.) [img]http://pacificpintos.com/broodmares/images/lakota2.jpg[/img] [color=#FF0000]Deelite: TT, LWO Neg, EE, SB1 Neg.[/color] [img]http://pacificpintos.com/broodmares/images/deelite2.jpg[/img] [color=#FF0000]Rose: TT, LWO Neg., Agouti Aa, Sb1 Neg.[/color] [img]http://pacificpintos.com/broodmares/images/mehe1.jpg[/img] 2011 will be the first foaling of the stallion to one of these mares. Are any of you breeding a horse with simular genes and can you give me any insights as to what to expect or how to produce foals like these horses??? Thank you for your help.