First, it depends on the female. If she's bright, reduced pattern, etc. then you pair her to the brighter morphs to attempt to make the offspring look better than the parent. Same goes if she's dark, then you look for darker morph males. If she has a crazy pattern then you look for males where the morph is noted for its odd pattern.

Second, if you want all morph babies then the stud will have to be either a super or allelic-type morph, e.g. lesser-mohave (BEL) or vanilla cream (fire vanilla).