There are many options for J. J for jump, jewelry, joint, junk, jugs and JPEG. Since the theme is photography, I considered J for JPEG. JPEG is a format to compress and store digital images. Then, I didn't have an appropriate photo to go with the post. This morning while drafting the post, I changed it to J for j instead, the alphabet 'j'.
Picture of the day in 2012: Faith Picture of the day in 2011: City skyline from JK Onassis reservoir