These rovings (from the top left) are a randomly dyed, hand-painted superwash merino roving using a combination of blues, yellows, reds and green, set in the microwave; a kettle-dyed superwash merino roving in oranges and browns; the bottom two are matched hand-painted sockstuff (merino and nylon) roving which graduates from red right through the rainbow to violet. I love the effect you can get from these in socks or in a shawl. There's also a number of ways you can spin them for differing effects. I never seem to get tired of these.
I haven't just done roving though. The top is a kettle-dyed sock yarn in beautifully rich tones of burgundy. This is exactly the sort of semi-solid yarn I was looking for the other week for the socks I started from the Sock Innovation book. (I had a few gauge issues and frogged them, though I'll restart them this week hopefully). The bottom two are vaguely matching skeins of sock yarn (these will be fraternal rather than identical socks) in reds and purples.