I'm new to quilting and when we've done fundraiser quilts, my mentor had suggested using the sheet trick, so that's what I've done, but I wait til bed bath and beyond clearances their 360 or 400 count flat sheets and use the coupon that comes in the mail for 20% or $5 off and it makes such a nice soft back, especially if it is going to be used and not just displayed.
It didn't know that would be "taboo" to do, it works so smooth.