Challenge: to take a picture every day, with me and something typical from the country I'm in at that moment (landscape, food, beverage, people, clothing, ... ). Obviously the point is to do this in a special way, or at least to try to be original.
How: use the automatic function on my camera or ask someone to take a picture.
Reward: Time-lapse movie of the pictures
Difficulty: easy (although staying original could be hard after being a while in one country)
Ave Maria (challenged by: best friend)
Challenge: to take a picture of a church (or religious building) in every country and to light a candle (or incense).
How: Find a religious building, go inside and light a candle or incense, take a picture (in- or outside)
Reward: One week Calella (Spain)
Difficulty: easy
miauw, miao, yaong en nyan nyan! (challenged by: best friend)
Challenge: to take a picture of an animal, on a weekly basis (no spiders if possible)
How: pull out my camera, take a picture when I see an animal and put it away again!
Reward: €5 for every week that I manage to do this challenge
Difficulty: easy (I take pictures of birds, reptiles and the likes on a very regular basis)