^ Yes, at least the filly I'm talking about is a Varnish. I don't have photos of them to post as they aren't actually "my" horses, so I'll need to ask permission. It was funny actually, because my sister REALLY wanted a SOLID black horse (don't ask me why) and was thrilled when this filly was born solid... and majorly bummed by the time she shed her foal coat into a funny grey/black pattern. (she also lost her mane and tail about then LOL )
She has a full sister who has a Snowcap... she hasn't changed from that - she gets a few more white hairs in the summer than the winter, but she's still a black filly with a white rump.
Dam is a classic Varnish... born solid bay and by three she has odd roany patches all along her topline and hips, with some 'rub marks' on her face (not real rub marks.. just those smudgey markings they get). As far as markings go they really make her look rather homely, it's a shame because she's a really nice little horse. (she too lacks a mane and tail... it doesn't help her 'image'). That little mare did everything, and jumped to 4'.
Their sire is actually the bay w/blanket I was talking about, before he was gelded. I don't think he is actually varnish. He's not getting any of the typical varnishing marks, he's just losing his solid bay coat in place of white with spots. I've found the effect doesn't turn up in photos quite as well as in person, but think of a movie 'fade in' and that's sort of the impression you get from his spots.
HIS dam looked like a leopard at the age of 3 (saw photos of her). She was born a mostly spotted blanket, and by 3 you'd have never guessed she had any solid on her at all.
HIS sire was a stunning bay with blanket and spots. He was changing at a much slower rate.
I was told that you can expect all horses with the Lp gene to change or shift pattern at some point in their life. Some do it to an extreme, others hardly change at all... I have no idea how true it is on the 'whole', all I can say my experiences with Lp is that it's an absolutely crazy gene and can do just about anything.
I'll see if I can get permissions to post my family's appies though... and I'll have to dig to see if I can find any foal pics.