Hi.
If the cream legbar rooster has both blue egg genes(homozygous) then all the female offspring will get a blue egg gene and it's dominant. Couple that with the brown egg coating of the goldline and you get a green egg, so all the pullets from such a breeding should lay green eggs. If he doesn't have both blue egg genes(heterozygous) then 50% will lay green eggs. I believe that's right anyway.
I used my legbar cockerel on my RIR and I love the pullets from this cross and intend to breed some more as they have great personality, are quite pretty and lay avocado/olive coloured eggs about 6 days a week at the moment. My RIR lays a dark egg though, so with a goldline you will most likely get a very pale green.