Here are a few NY Mets players that are 2K versions which I updated with better facial hair, lightened/darkened, changed skintones. Just unzip, then copy/paste each file into your main 2k12 directory. Use Ty's editor to make changes as noted.
What's New in Version Final Version
Tim Byrdak face ID# to 6311, body type to Buff, Average, skintone to 5
Ike Davis body type to Buff, X-Large, skintone to 1
Bobby Parnell body type to Buff, Large, skintone to 1