Center for a New American Dream has a nicely done “Alternative Gift Registry” tool (currently the #4 Google result for “gift registry”!) that allows you to create gift registries that de-emphasize consumerism (used goods, donations to charity, experiences rather than stuff, etc.).   This is a great example of a nonprofit advocacy group coming up with a valuable public-facing service that is grounded in its mission and expertise to bring people into the circle of engagement.