Separate breadstick dough into 10 strips; set garlic butter aside. To form cobweb, gently stretch and twist 4 of the dough strips, placing over cheese to form a square in the center of the pizza, tucking ends under crust. To make spider legs, gently stretch and twist 4 more strips and place over cheese in a wheel pattern crossing in the center (there will be 8 legs), tucking ends under crust. Gently roll remaining 2 strips into 2 balls, making 1 larger, and place side-by-side at center to form spider head and body. Pinch edges where 2 balls touch to hold together during baking. Brush garlic butter over breadsticks; sprinkle with paprika and pepper. Press 2 capers into smaller ball for eyes.