In case, today's date is 15; then a corresponding entry which is nothing but the number 15 could be like this:

The description for this photo could be like this:

"I found this number near a walkway towards the temple. This is the street number, I suppose."

Post both the image & the description as a blog entry. The title of the blog post should have the word "1two3ty1", like "Entry 15 for 1two3ty1".

ps: the above image was from Allison (http://www.flickr.com/photos/allisonnewhouse/)