Here are some small ways to help that, if done on a large scale, can make a positive change.

Recycle used markers into clean fuel: The Crayola Colorcycle marker recycling program pays the shipping for schools to send in used markers to their NY facility, where they are turned into clean fuel.
Why it’s easy: Sign up your school, put out a box to collect old markers, then when you’re ready to ship, print out a free label from the program’s website.
Donate shoes for micro-enterprise: Soles4souls collects used shoes and other items to support micro-enterprise in areas like Haiti.
Why it’s easy: Collect shoes + clothing, and either ship to them (you pay shipping) or (easier) drop off if you’re near one of their warehouses.