Dave... Do you have a name for the one in the 5th photo and also prominent on the left in 6th? Gorgeous plant with striking verigation.

geo it's probably argentea variegata-although ovata variegata or tricolor are both possibilities, this sounds obvious, but the way to get good variegation is to take cuttings of the most varied branches-the chlorophyll problem means that rooting and growth may be slower but the results are worth it i think.

I believe Crassula argentea is an old name for C. ovata. Crassula ovata ssp obliqua variegata (with pointed leaves) is 'Tricolor'; Crassula ovata variegata, has rounded leaves.