Scooty's Design has made a beautiful calendar for 2010. It is realized A4 landscape (29.7 cm x 21 cm) so that everyone can print it. It's currently only available in a French version but it will be soon available in English. You have the choice between a QP pack, where you simply insert your photos, or a template pack that you can decorate according to your wishes.
You can find it at Scooty's Designs new shop The French Frog.