Leghorns lay white eggs.
I have exchequer (black and white flecked) leghorns which are really pretty but they only lay medium sized eggs and not as often as white leghorns... second year as expected their eggs get a bit bigger. They are flighty and dislike being touched or held but they are curious, quirky little birds and I like them a lot. They much prefer being free ranged to being penned in and they get absolutely everywhere because they are so curious! They can be quite sneaky about where they lay their eggs when they free range too.... I have an egg hunt involving ladders and crawling into small inaccessible places almost every day. It's fun for the first few weeks, but then the novelty wears off a bit. I keep them in an old farm yard with my horses and they have the run of all the stables and sheds and there are many little nooks and crannies where they can hide eggs and because they can fly, they are often up in the rafters. Two of them let themselves out of a tiny hole in the eves of the stone stable I keep them in every morning before I get there, but they come running to see what I've got the minute I arrive.