The Spoonflower Handbook is here!
For the wall decals: I can center the calendar on either the medium or large decals. The large will have the calendar centered with a white border all around. The calendar portion will be just slightly larger than the 21 x 18 inches of the tea towel, at approximately 25.3 x 21.75 inches. The medium will have a white strip down each side, with the calendar being 15 x 12.8 (approx.) inches.
Check to see how it is currently displayed before you order, and send me a message if you want the size changed. I will do it as quickly as possible; but you will be seeing what ever the current size request is.