Cut a fruit leather strip in half and stack the two halves. Use the top of a small heart cookie cutter (preferably fluted) to cut petals. Repeat with the remaining fruit leather. (You'll need 8 to 10 petals per cupcake.)
Arrange the fruit leather petals on the cupcakes in concentric circles. Leave the center of the frosting uncovered.
Put the chocolate frosting in a resealable plastic bag and snip a corner. Pipe a circle in the center of each cupcake, then pipe rays coming out to look like a sun. Place a chocolate kiss upside down in the center of each.