Piecemakers Quilt Calendar is a quilter's challenge. You can get a pattern book if you like and maybe it's laid out a little better, but, the blocks are large and the pattern pieces have to be joined together by flipping through pages and finding the connecting pieces. Piecemakers is an organization of sorts that supports various causes and is a quilt shop as well.
I'm working on the 2003 quilt calendar and have completed several blocks. I've actually put it down for years and am now picking it back up again as I have felt the need to finish some of those pesky UFOs.
On my design wall are a few of the blocks for my calendar quilt, which is a 12 block pattern with a medallion center all trees and crazy quilt designs. Next to a couple of those blocks is a block of the month from one of my favorite LQS's. It's a Christmas quilt using strip it material. This is a striped fabric that makes making half square triangles a cinch as you are cutting into the printed strips of fabric and basically sewing squares together, instead of piecing the triangles.