Off topic, but you might want to clarify the licence a bit. It's a bit nitpicky, but you did not specify if we can create derivatives (though your intro message about adding photoshop layer styles strongly implies it), and if can sublicence it, etc. You also might want to add some disclaimers that waive any warranty and liability you might have.
Try http://www.tldrlegal.com/ and pick a licence, if you want to, that might help.