Divide frosting into 2 medium bowls. Tint one bowl green and the other bowl purple. Slowly pour frosting over doughnuts. Place candy eyeballs around doughnut. Let set. Stick slivered almonds in the hole as teeth.
Place plastic teeth in donut hole. Insert 2 chocolate pieces per doughnut as eyes. Place jelly in a re-sealable plastic bag and drip some on and around the teeth.
Transfer frosting to a resealable plastic bag. Swirl frosting on top of brownie. Dip into nonpareils. Place brownie on top of doughnut hole. Draw 8 lines on each donut, 4 on each side of the brownie. Pipe eyes on brownie to resemble spider eyes.
Transfer frosting to a piping bag fitted with a small ribbon tip. Pipe white stripes over donuts like a mummy's wraps. Place 2 same colored mini pieces on each doughnut as eyes.