This is a calendar that you can reuse over and over again. Each month, just pop out the tiles and set them in place for the new month. You should mount this in a frame or something with an incline, as nothing but gravity keeps the tiles from coming out while it's in use.

I made these for Annelies' and my wedding in October. They're made to be attached to little plastic bags with Texas pecans in them, but they can also be used for window ornaments.

Try #3, trying to avoid a fill on the big rectangle.

This didn't render correctly on the Thingiverse site, and Firefox 3 doesn't handle the text area quite right either. However, it did import into Corel Draw, although we had to fix the sign part. I'm going to try to fix the file a little more and reupload.