FabShopHop has a free pattern for "Whimsical Quilt," a design by for Camelot Fabrics by Lorene Smith.
I've seen this pattern -- or variations on it -- several times. Every single version has been charming. It's not that difficult to make, either.
Do it in solids, marbles or batiks, with black outlines, and the design strongly resembles stained glass. (In fact, that's how I saw it first.)
Go here for the pattern and free download.