There are several sites offering online customization for printing calendars. I think they are all good and offer some form of customization. You can choose any site you like. Plifeprint.Com seems a good site too. You can even hire your own graphics designer from here. They are offering services and online customization at low rates. Quality of printing is reasonable too. I think you should read their user comments if you are really confused or unsatisfied. Users say the site and its services are good. Supported formats include adobe Photoshop and adobe illustrator along with adobe indesign. You can even contact them via email or phone for personalized customization.