While it's certainly possible that blue eyes are a mutation of a separate gene closely linked to the gene containing the various mutations that make blue eyed leucistics (mojave, lesser, butter, Vin Russo, Mocha, phantom), it doesn't seem likely given that all these different (with the possible exception of lesser and butter) mutations would be found linked to the same separate blue eye gene. I think it's more likely that blue eyes are just one of the expressions of being homozygous for a mutation of a single gene just like the white skin.

Perhaps a more likely example to demonstrate crossover would be when trying to combine two presumed separate mutations, like axanthic and hypomelanistic. However, again, not particularly likely for any given pair with the limited data available yet.