Our Photo Desk call-out for reader photos for the week of Dec. 10-16 is on the theme of winter. Images uploaded to us through Flickr are contained in a separate gallery. This gallery showcases images sent through our custom upload tool. Our staff will pick a favourite reader-submitted photo to be featured in the Dec. 17 print edition of The Globe and Mail. (Preference will be given to photos taken during the week of the call-out.) To learn more, follow the links under the gallery.