Ernst Haeckel’s masterpiece, Kunstformen der Natur (Art Forms in Nature) is available for both low and hi-resolution download. The wonderful thing about this resource is that not only are the original plates inspiring but you can also download files of the outlines too, which are ideal as jumping off spots to developing a design that can be translated to fiber.
Above is a screen shot of the original detail drawing and the line drawing placed side by side so you can see what I mean. As you can see the line drawing is simple enough to start developing a design which can be applied to various textile techniques.
Candida a regular reader kindly emailed me the link to this fantastic resource