Last week I just bought a welcome banner that also had patterns to make for 4 months (Jan., Feb.,Mar., April) that are interchangeable. The Welcome background is 17" x 24 1/2" and each monthly quilt block is 12" x 12". I'm sure you could adjust the measurements to fit your needs.
They're called "Turning Pages" 1, 2, and 3 depending on which months you want. I bought all 3 so I would have one for each month. I either got them from Clotilde or Connecting Threads. Not sure which one. I think Clotilde though. Here's their website: www.scrapsoftimequilts.com
Hope this helps.