When creating a skill 1 of the often overlooked aspects is the design of the logo. I have been guilty of this myself and ended up with an image that did not work out so well.
An issue that I had not considered originally was the fact that Amazon encase the skill logo in a circular frame. This will leave some aspects of the original image hidden and it is of course important that vital aspects of your logo are not contained within these hidden regions.
With that in mind I have created a PSD file that allows you to place your logo into a mock-up of the Amazon frame. The PSD can be downloaded from the Alexa Tools Github repository (direct link to the PSD).
I hope that this tool may come in useful for some. If you have any suggestions or can enhance the tool be sure to let me know or better yet create a pull request.