Our target group is the 20 to 40 crowd.
All lowercase letters has tested well in some of our focus groups. For example, renew is all lowercase. All uppercase is too LOUD and a mix of upper and lower seems confused.
Please stay away from green, arrows, triangles or anything else related to reduce, reuse, and recycle imagery.
Some of the submissions should play up the "re" as this will be a part of our branding for other things we do in the future. Brackets look nice [re] if they are done right. I would love to see a unique [re]new logo and then just the [re] part on its own so we could couple it with other things later.
For example: recharge, recreate, regenerate, restore, & revitalize!