Hey Scott, I was browsing a web site that was posted in the classified area (Thanks Ruth Camp), I saw some feedsack fabric and thought of you. Maybe some of this would work with the Mother Goose blocks. There are 3 on the bottom of the this page, and one more at the top of the next. Plus...its on sale :) which is never a bad thing.
Here ya go...hope it helps.
http://www.heartofdixiequiltshop.com/SearchResults.asp