Sedum rubrotinctum 'Aurora'. You can't get much easier than this. It has beauty in simplicity and it's easy to grow to boot. What more do you want?
Oh, I know. When you've been around these plants as long as we have - growing them for over 40 years - you sometimes get a little jaded (an interesting use of words, and I'm sure confusing to the non-English speakers) with simple and "basic" succulent plants such as this. We want something more challenging!
I hope that doesn't represent my attitude, but I'm sure it does at times.
So, if for no more reason than to remind myself of a basic truth, let me state it again: Easy is good!
Crassulaceae family, but that's a very large family, with about 33 genera, of which Crassula and Sedum are just a couple.