That's one of the reasons I tend to avoid swaps - especially with people that I know I'll be interacting with an a face-to-face basis - and that I usually like.
I figure if 8 out of 10 got it right, it's the other two that for whatever reasons misunderstood or chose to ignore what was requested.
I think I'd make "matching" pillow cases to go with the quilt. They take up less storage space than pillows.
One could always say that because of their uniqueness, you didn't want to mix them in with the other blocks. :?