My body is ready....
It has not been done no! A few of those have been done in similar styles though, mainly the mushroom and Yoshi egg.
To get them done, first, an Interest check to gauge who would want them, and due to copyright laws, they would have to be dyesub from Imsto. There is currently one novelty cap buy running with imsto right now, so maybe when it is done and shipped, this can be a viable set.