Anyone for a game of Tag Poker?
It could go something like this:
1.) somebody posts a picture from their own gallery and names one of he elements in it, say "window"
2.) somebody else posts another picture with a window in it, and raises the stake by naming another element in the new picture, along with the window, like "window, lamp post".
3.) the next person playing has to post a picture with a window and a lamp post, and yet another named element, say "window, lamp post, flower box"
...and so forth, until nobody raises the tag stake any further for, say, 24 hours.
When this happens, the last photographer who raised the stake may post a new picture and name one element.
If he or she doesn't post a new picture within another 24 hours (that's 2 days after the most recent posting), then starting a new round is "up for grabs".
Is it too complicated? Shall we try it?
Let me start it off, tentatively, with one of my Christmas day pictures:

...and my stake is
drain pipe
The next picture could be, for example, a shot of a shop with a drain pipe down the side, and the stake could be raised to "drain pipe, shop window"...