How can I fill the inside of a polygon with an image?

[sofakng]

I'd like to create a polygon (convex or concave, both cases!) and then fill the inside of the polygon with an image.

Ideally, I'd like the image to optionally repeat if the polygon is bigger than the provided image.

Can anybody help me out with this or at least point me in the right direction of which functions I should be using?

Thanks!!!