C-DOWN +R = CHANGES HEAD SIZE
C-LEFT +R = CHANGES BODY SIZE
C-UP +R = CHANGES HEIGHT

CODE			WHAT IT DOES

010001			elongated players, large heads, large announcer
010101			large players, large heads, large announcer
010010			crunched players, large heads, small announcer
110110			large players, small heads, large announcer
000001			elongated players, large announcer
000010			crunched players, small announcer
000100			large players, large announcer
001000			small players, small announcer
110000			stocky players, small heads
010000			stocky players, big heads
100000			stocky players

Ski on your head:
Go to Olympic mode and select Freestyle Aerials. Then pick any trick. As you go down the hill don't press any button. Wait until you have left the ramp then rapidly tap the B button. When you land your skier will jump forward and land on his head and continue to ski down the hill with his head in the snow.

Thanks to Revolution readers Jeremy and Lynette!