I've been trying to take my heels off throughout the day for TOMS Shoes One Day Without Shoes. For every pair of TOMS purchased, they will donate a pair to a child in need. Toms.com says, "We are asking people to go the day, part of the day or even just a few minutes, barefoot, to experience a life without shoes firsthand, and to help spread awareness of the impact a simple pair of shoes can bring to a child's life."
I've never had a pair of TOMS, but I think I'm going to buy this very fun pair called 'Cultural Anthropology' from Nordstrom ($54.95). They're made of recycled twill.