There are already a long list of special interest licence plates in California.
Please see this link:
http://www.dmv.ca.gov/online/elp/elp.htm
The proceeds from these licence plates are used to fund various special causes.
Environmental license plates
September 11th California Memorial License Plates
California Arts License Plate
Whale Tail License Plate, sponsored by the California Coastal Commission
Collegiate License Plate funds need-based scholarships
Lake Tahoe License Plates are deposited in the Tahoe Conservancy Account
Yosemite License Plates benefit Yosemite National Park
California Firefighter Plate are deposited in the California Firefighters' Memorial fund.
Kids License Plate are deposited in the Child Health and Safety Fund
Olympic Training Center License Plate supports the U. S. Olympic Committee's training center
Veteran License Plate benefits participating county veterans service offices