I assembled the first of the new Nyan Boards. It could be programmed, but it didn't do anything. I spent an hour debugging all the connections and checking connectivity on an unpopulated board and all that -- nothing. So I assembled a second one. It couldn't even be programmed. So I removed the chip from it and tried another. Same. Then another. That one worked.

I think that keeping my attinys loose at the bottom of the drawer might have been a mistake.

(Oh, and I used yellow LEDs, because the green ones didn't arrive yet.)