There's a plant from New Zealand called arthropodium cirratum, or renga renga lily. I've seen it around in people's gardens a lot in the last few years - it loves shade, it's drought-tolerant and it has gorgeous little white flowers in the spring. I've been thinking about getting a few for a while and finally decided to put a few of the miniature version (te puna) under my vitex. The vitex has gotten big enough that it should provide a decent amount of shade. I can't believe how quickly it's grown, actually - look how tall and full it is! The arthropodium are the grass-like clumps in the dichondra. I also ripped out the wild violet that was in the back of the bed. Yes it's a nice hardy clump, but it quickly became a messy mass with almost no flowers. Some "weeds" have their uses but this one looked likely to get out of hand.
I think it might be too late to see these ones blossom this year, but if they do I'll post an update!