I'm all for themes.
I liked the Weekend Warrior Challenge where a topic was given, I.e. "Tanks," and on the weekend everyone posted pics of tanks in action.

Phan or Fooey was a good one

There was another where the host of the challenge would assign a character to you and you'd post a pic and do a short write up of the figure/character.

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The United States will conquer Terrorism with the help of God and a few Marines.

Some people, when trying to avoid thinking about those things that cause them pain, turn to drink, or perhaps food, or drugs... I turn not to any of those... I collect action figures, turning my mind to the hunt, so that I might find a mote of peace... Over the years, I've found that alcoholism is much more socially acceptable by far.