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after mixing the cake up like normal,
divide the batter evenly between 6 bowls.
use food coloring to make your tie-dye colors.
i went with:
red, orange, yellow, green, blue, purple
& kept them on the softer side for a springy rainbow.
put a (relatively) small spoonful of each color into each cupcake liner,
stacking the colors on top of one another
& not swirling.
bake as directed.
for the frosting:
divide between 6 bowls & use the food coloring to make the same colors as the cupcake batter.
fit a piping bag with a wilton 2d tip.
put a spoonful of each icing in the bag.
i went around the side with 4 colors & put the last 2 in the center.
pipe to your hearts content!