First off, I am by no means an expert in Minecraft skin creation, however I would like to share with you this quick thing I made.
Along with completing the original palette of your skin to form a full rainbow spectrum, I have not altered essential features like the eyes, mouth and headphones, preserving the sense of identity associated with the skin. The rainbow base colour has been given a nice fluid and swirly look, however I should note that the anti-aliasing-ish features are not consistent throughout, because I made the head and body first and just (lazily :p) streched out the textures.
In case you do approve of this early design, I can finalise the skin and maybe put it up for download!
Thank you for reading, have a nice one!
HS20