Here is an article on egg color inheritance. The blue egg gene is also located close to the pea comb gene. Forgot to add that Faverolles crosses often have extra toes.
http://www.communitychickens.com/2013/03/all-about-egg-color.html#.UxtsqPldWQM
They will have partially feathered legs and the egg color will depend on what genes the hen carries. Most likely the Fav will contribute the brown egg gene.