This is the only, and mean ONLY thing I don't like about TMO. Realistic or not, I can't really stomach the ocean colors.
Caustic created a little mod that you may be interested in.
http://www.subsim.com/radioroom/showthread.php?t=194657
There's a TMO compatible version too. Tones down the colors to what I think is a more realistic color, and yes, I've seen the Pacific.