The variegates

Coryphantha elephantidens is totally variegated and thus has to be grafted. It is not an easy plant to grow and does not like cold temperatures , otherwise it get marked easily.

Variegated Astrophytum asterias are getting more common among the cactus world. They produce offetes that can be grafted or rooted if they have some chlorophyll.

Echinopsis eyresii grows well on its own roots.

Gymnocalycium crest and variegate.

Gymnocalycium variegates are vary popular in nurseries and among the general public. They have colourful stems due to lack of chlorophyll and thus all of them have to be grafted. Much more rare are cristate variegated specimens of this Genus.