There are many places where the "linen" texture is used in Lion, from the Login Window to various app backgrounds like Safari and so on.
Is it possible to replace this image with something else? Let's say I have a nice hessian weave pattern from a lovely house I lived in that hasn't been decorated since 1979, or some sand, or a patchwork quilt depicting the transperambulation of pseudo cosmic anti matter?
Whatever I wish to change it to, a) can I change it, and b) will it change it for all instances where the linen appears, or does each application have it's own resources which would need ammending one by one with differing methods, and c) is there a particular size/fileformat/other feature that any replacement image must have, for example must it be a 200x200 PNG that tesselates etc.