got it
I emailed them and got this wimpy response...
Dear Melanie,
We have a Citizens' Stamp Advisory Committee made up of non-postal personnel who select all new stamps that we issue each year. Please send your suggestion to the following address:
Citizens' Stamp Advisory Committee
Stamp Development
US Postal Service
1735 North Lynn St Rm 5013
Arlington VA 22209-6432
http://www.usps.com/communications/organization/csac.htm
Common suggestions for new stamps include stamps to honor a person. We'd like to point out that a person can only have a stamp issued in their image if they have been deceased for at least ten years. The only exceptions to this are stamps honoring a President of the United States.
We hope this information has been helpful and answered your question. If you have any further questions, please do not hesitate to contact us. Thank you for visiting and supporting our web sites.
Cheryl