This image does not do justice to the colors of these threads, I'm afraid. The image I posted previously shows the lovely subtle shades in the lighter thread to better effect.
At this point, I thought I was ready to start the last round of motifs, but I had not paid enough attention to the pattern. The repeats in this round are all wrong! Instead of an outward facing chain between all of the clovers, there should have been such a chain between every pair of clovers. I cut this all out and started again. In fact, I was almost finished re-tatting the round when I finally realized something I would probably have noticed earlier had I done more of my tatting in natural light.
As you can see, I decided to try two variegated threads together, and I DO think that part was working out very nicely. The problem? The second variegated thread does not 'go' well with the solid of the center medallion. If I could keep them as far apart as they are in this image, I might have continued, but the next round of solid medallions is going to join to that second variegated thread. The two purples just clash in my opinion.
I've started that round again with a solid green. No photos so far, but I think it is working out better. I'd like to come back and try these two variegated threads together again in another project.