These are the 5 AL East teams' home and road uniforms, with colors corrected to match the official MLB style guide. Orioles orange is much brighter now, Red Sox and Yankees blue is much darker. Also the Red Sox and Yankees road greys are much lighter. I plan on doing all the teams; it enhances the realism a lot when the colors are correct.
Extract ALEASTUniforms.zip to C:\Program Files\2K Sports\Major League Baseball 2K12.
Extract RosterCOLORCORRECTED.zip to C:\Users\(yourname)\Documents\AppData\Roaming\2K Sports\Major League Baseball 2K12\Saves.
Then, in-game, load the new roster file (RosterCOLORCORRECTED).
Thanks to DetroitStyle for explaining how to use Ty's editor! Thanks to Ty Wiggins for the editor!