I used to not wash my quilts before giving them away, then I did a pantograph on one and left a slight gap between 2 rows by mistake. I free handed a design on it to blend in, which actually worked out really well, but still I wasn't quite happy with it so I washed it and it crinkled up just enough that I'm sure no one but me will ever notice my mistake.
Recently I used wool batting for the first time. After it was washed it got super crinkly. I'm a little disappointed because I went to a lot of trouble to make a pretty feathery design and you can't really see it because it got so crinkly. It is fluffy though, which is nice.