Thanks for that. I have found a great app that I can use to make the art works well.
On another note I have gotten one 16x16 png image showing on the Unicorn HAT HD, by editing the show_png.py example which works well. However, I want to incorporate showing the image with a button push and so want to be able to code showing the image in the most basic way possible. I know the show_png.py file has code for interating though a matrix of pixel art. I am having trouble simplyfing it down any help would be greatly appreciated.