I thought I'd better test a tiny quilt, though. Just on the off chance I wanted to make an appliquéd crib quilt someday that might need a few spins in the washer from time to time. So I whipped up another Fiesta tiny quilt and keep throwing it with every load of our laundry. We don't have laundry equipment (other than a bucket and plunger) on board, so this test piece gets washed and dried in various commercial laundry machines wherever we are hanging out.
Not so shocking news: they do shrink. This one started out 8.5" square. And they wrinkle.
Better news: the appliqué seams are holding up so far. This is after 10 washings.