I did a quick green:
or pink: 
I had done a yellow earlier but just got home to post it

Dexter by ❤
I have a series of images that I had coded to cycle but it wasn't a minion and all the images are broken because tinypic so it is not even working right now xD. You might ask on the profile and graphics discussion.
Dexter by ❤
I use an image rotator on Munchers profile, you should be able to use it for your minion's overlay! You just use the image code same as you would for any other image code. The image changes with each page refresh. This is the website I use, there are other ones too - just Google "sig rotator" or "image rotator" and you'll find them :) The website I use is super easy and free, if you decide to use it and have any issues let me know. :)