Food, dogs, gardening, books.
wait a minute... that was a great hint.
If you've been following the What Is It? game for a while, yep! I just liked the way it looked.
I missed it again. At first I thought it looked like skin, but unless your camera goes beyond macro to microscopic, I knew it had to be wrong.
Betts, skin is an interesting guess! It's kind of correct, in a weird sort of way.