I've seen so many of the rocker cards I just had to have a go myself:
I used my Craft Robo to cut out the circles and the topper, I cut 2 of the topper shape and sandwiched the stamped image between the 2 sheets of card.
The image was coloured with speccies.
I just need to add a sentiment and make a box for it, I'm going to attempt a circular box. If I manage I will pop it on here later!