Glad to see this is still getting some use. I'll probably steal the easy challenge after work today.
.Chris
EDIT: Scratch that. Almost 50MPH head winds for about 4 miles to get to my city limit sign. Feeling lazy today, maybe i'll try it tomorrow..haha
EASY: Bike in front of (your) city limits sign
MEDIUM: Your bike on some (ANY) form of public transit
HARD: Your bike in profile view with the sun rising behind it. Street cred points for multiple bikes in the shot