I finally settled on a fabric for my 18" pillows. I found a beautiful brushed cotton denim, which is a heavy twill. Considered a utility fabric, it's function suits it's use. It has a soft finish but will stand up to long summers with constant use, and would be great for a coastal cottage.
The bright white of the fabric brings out the best of the water-based pigment inks that I use, giving bright and clean colors. These are printed on both sides and have a pattern, though it doesn't repeat, exactly.
I hope to have them available on the site in another week or so.