Originally Posted by Mariposa
You could use the blends for projects other than quilts: aprons, small gifty items, etc. Just a thought...
Welcome to one of most opinionated hobbies in existence! Ask 15 quilters ... you'll get 15 different answers none of which are 'wrong'.
To add to Mariposa's idea, you could also make some dinomite pillowcases!
For what it's worth, I was taught that you don't mix poly fibers with cotton for all the reasons listed above but also because poly is stronger than cotton. The theory presented to me in this class was that the stronger fabric would 'wear out' the natural fiber. I was taught use cotton thread and not to use poly thread on cotton for the same reason.
Bottom line, use caution, and don't make an 'heirloom' using mixed fibers.
You're in for a wild ride ... quilting is a 'calling'!
Peggy in Frigid Florida