This is what I do when I'm letting a story process in the back of my mind.
It keeps my hands and eyes busy while leaving my thoughts free to work out dialogue or plot.
This one was a 2000 piece puzzle so it gave me many hours. The next one is a 5000(!!!!) piece that my sister gave me for my birthday. It will be tricky because it's so large and won't fit on the table completely. I'll have to sort it out in sections. Already looking forward to it. :)