Rabbi Baum talks about leading a chocolate seder for Passover.  Complete with all the symbols:

Parsley instead of strawberries

Chocolate sauce instead of salt water

Frosting/pudding with marshmallows and chocolate chips instead of typical charoset (made of apples, nuts and wine)

Chocolate covered matzah or chocolate graham crackers in place of boring matzah

Chocolate milk in place of wine

Bittersweet chocolate in place of maror (bitter herbs, usually horesradish)

Cadburry eggs instead of roasted eggTwix bar in place of shankbone

haggadah Section: Commentary / Readings