Frost the cupcakes and smooth out the top.

Draw three concentric circles on top of the cupcakes with the decorating gel. They don't have to be perfect - obviously!

Take a toothpick and draw it through the circles; start at one point and draw the line from the center out, draw the next one from the outside towards the center, alternating as you go.

Top with plastic spider ring (then you get jewelry with your cake!) or a spider gummy.