Philadelphia's Public Art Program invites artists to submit an application with the Public Art Artist Registry.
The registry allows artists to participate in all selection processes by maintaining a record of their work that will be consulted by Public Art staff, panelists, architects, and City agencies as public art opportunities become available. The registry is open to all professional artists. There are no residency requirements for the registry, although some opportunities will be limited to the greater Philadelphia region. No entry fee.

Details:

http://www.phila.gov/publicart/textPages_beta/Opportunities.html