PREPARE cake batter as directed on package. Add dry pudding mix; mix well. Spoon evenly into 24 paper-lined medium muffin cups. Bake as directed on package for cupcakes. Cool completely.
BEAT cream cheese, butter and vanilla in medium bowl with electric mixer on medium speed until well blended. Gradually add sugar, beating well after each addition. Spread evenly onto tops of cupcakes.
PLACE 1 fruit snack on top of each cupcake. Add 1 candy-coated chocolate piece to center of each fruit snack for the eyeball. Draw squiggly lines with decorating gel from the eyeballs to outsides of fruit snacks to resemble eyeball veins.
Prepare as directed, using any flavor cake mix.