Red Letter Day is an older line by Lizzy House. I purchased these at my LQS last winter when I was working on my modern Valentine's Runner. I love the whimsical nature of these prints - I think the pearl bracelet and awards are my favorites. I couldn't find a photo of the full line on Andover's website, but here is a link to there free quilt pattern using the line, I think all the fabrics are represented here.
So see more Sunday Stash, check out the flickr group.