The piece of fabric at the top is wool which has been laid out on the grass for 20 minutes or so. The bottom piece is cotton which has been out of the pot for about 5 minutes and has started to turn from yellow to green to blue.
Indigo on wool
Indigo on cotton
Indigo on silk.
The piece I like the most is silk velvet (on the right above and below) I can't help stroking it. I think it is a flashback to when my Grandma used to give me fluffy bits of rabbit skin to play with when she worked at a fluffy slipper manufacturer!