We're an industry association of online marketing companies. We're a professional services organization comprised of member companies.
We are business to business offering. Our client is our member, and we want them to display this seal / badge on their sites and in their emails. Think of us like the BBB (bbb.org) or TRUSTe. You will see their seals and badges on sites and in emails. That's just what we are looking to do but with our brand - LeadsCouncil - http://www.leadscouncil.com
We are looking for something that will make other companies proud to display the seal. Professional is the key. Something that looks authentic and mature. Nothing cartoony. We also don't want our logo wrapped in a simple rounded oval. No real skill in that.
We have two membership levels - Founding Member and Member. The seal / badge should be able to accommodate both. You will see from the examples below that many have room to designate the type of members.
Example badges in action:
http://www.hotels.com/ - verisign secured at bottom
http://www.verticalresponse.com/ - bbb, and two industry specific associations (which is what we are)
http://www.thesearchagency.com/ - many industry specific associations, as well as TRUSTe. TRUSTe and SEMPO are the closest parallels to what we are / do.