Star Wars: The Clone Wars - Republic Heroes

Big heads:
Press Up, Down, Left, Right, Left, Right, Down, Up at the "Cheat" menu in the shop.

Mini Gun:
Press Down, Left, Right, Up, Right, Up, Left, Down at the "Cheats" menu in the shop.

Ultimate Lightsaber:
Press Right, Down(2), Up, Left, Up(2), Down at the "Cheats" menu in the shop.
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Spider Droid:
Press Up, Left, Down, Left, Right, Left(3) at the "Droid-Jak Upgrades" menu in the shop.

Lightsaber Throw:
Press Left(2), Right(2), Up, Down(2), Up at the "Combat Upgrades" menu in the shop.