Today is the 25th, so are you talking about the 26th or 27th of December?
If you are sure about the date, click on the 'Archive' link at the bottom of this page.
Click on 'Pictures'. Now you will get a list of all the posts in the Pictures forum in reverse chronological order. Just keep going back until you get to the date(s) you are looking for. Probably on page 2.