The source of my concern is that OS projects cannot avoid hosting assets independently (The few I know of that do not are working with commercial products that should be end-user-supplied anyways).
In any case, I am assuming these sets cannot be used for my projects (OS/future OS).
Thank you for clarifying the design on those fabric textures. All you really need to do to the original textures is make the horns the same color as the bones, or at the very least make the horns and spike different colors. The first option will make it look like the horns belong to the skull, not the spike below, while the second will clarify that it is two separate shapes behind the skull. (The version without either will still be very helpful for others though)