I recently bought a pack of Lightbox Photography Cards (and chipped in on the Kickstarter for the new Macro version). It's essentially a deck of 52 cards with each one featuring a photo challenge and brief description. This gave me an idea that they could be used for a 52 week project for 2016.
The idea is simply that at the start of each week I will choose a card at random from the deck and take a photo to satisfy the challenge.
To record my exploits I've created a group on Flickr that is also freely available for others to join and take part. The rules are one photo per week (fitting the challenge of course) and no restrictions on camera or medium.
If you fancy joining for the new year the group is
https://www.flickr.com/groups/52project2016/