I'm completely dumb in colors (as I never had a need to study it and not very interested), but do you ALWAYS get palomino from Cremello when mare is chestnut? I'd think no (and I very well may be wrong).
OP, the big problem with breeding is it can go wrong and you can lose your beloved mare together with the unborn baby. Or baby may be very far from what you expect. If you love lines and color so much, why not to just look around at the babies that are already on ground? This way you know 100% what you are getting and you can choose what you like.