Hi Doron,
There are some neat examples of local and creative offset projects that have been led by colleges and universities if that is what you are interested in. Some examples are below:

• Brown University has begun an innovative effort, Community Carbon Use Reduction at Brown, that provides support for reducing carbon emissions in the greater Providence area. Brown and the Sidney E. Frank Foundation have committed $350,000 in support for student-, faculty-, and staff-led projects. One of the first tangible projects to emerge is Project 20/20, a campus-community partnership in which students are replacing incandescent bulbs with more-efficient compact-florescent models in the community surrounding the university. The project hopes to replace bulbs in 15,000 homes.
• Ohio University is spending $50,000 from a grant on projects that reduce energy waste in off-campus student housing. Through energy-efficiency audits of residential properties, the university will provide recommendations and financial support to students and landlords interested in making efficiency improvements.
• University of Colorado at Boulder students are purchasing locally-generated offsets to mitigate a portion of campus emissions. The students are using $50,000 of their student fees to purchase these offsets through Gov. Bill Ritter’s “Colorado Carbon Fund.” In addition, students trained in energy auditing are helping to make energy- and cost-efficient upgrades in the surrounding community through the Community Energy Connections program. Student auditors have installed high-efficiency light bulbs and showerheads in low-income homes and provided community members with education about energy efficiency.

The ACUPCC published The Voluntary Carbon Offset Protocol that you may also find helpful. I hope this helps.