Heat the oil in a large skillet over medium-high heat. Add the beef and cook, breaking up any clumps with a wooden spoon, until browned, 2 to 3 minutes. Lower the heat to medium and stir in the beans, chili powder, 1/4 cup of the salsa and salt to taste. Cook 2 minutes.
Heat the taco shells according to the package directions.
Fill the shells halfway with the beef-and-bean mixture. Top with some of the remaining salsa. Add the olives, sour cream, lettuce and tomato. Fan the avocado slices down the middle of 4 of the tacos, making sure the tips peek past the top.
Lay 1 taco with no avocado flat on a plate for the head. Place 2 halved olive slices on top for eyes. Put an avocado-topped taco upright and perpendicular to the head for the body. Add 4 green pepper legs and 1 tail.
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