I actually had a thread about leg color and mottling a few weeks back:
https://www.backyardchickens.com/forum/viewtopic.php?pid=7713483
I have a few of those lavs with the mottling gene and I have been trying to bring it out in the splits but am having a tough time getting it to "stick". I remember when people first starting getting chicks from Hinkjc's early lavs and there was mottling popping up here and there. I don't know why more people didn't make a go of it
CelticOaks: I had good luck with eggs from Wildhorsefarm out of NC on ebay. They seem to get good reviews, but I don't know if they've been working with splits to improve or not.
https://www.backyardchickens.com/forum/viewtopic.php?pid=7713483
I have a few of those lavs with the mottling gene and I have been trying to bring it out in the splits but am having a tough time getting it to "stick". I remember when people first starting getting chicks from Hinkjc's early lavs and there was mottling popping up here and there. I don't know why more people didn't make a go of it

CelticOaks: I had good luck with eggs from Wildhorsefarm out of NC on ebay. They seem to get good reviews, but I don't know if they've been working with splits to improve or not.