honestly, i just made that while fooling around
it's a teal-blue-teal gradient with a bluegray abstract brush on burn, a light blue grunge brush on difference, and a dark teal grunge brush on dodge
to get the edges, i drew a selection using the free select tool and activated my quick mask. picked by like 20 or something (idr exactly) and gaussian blurred it by 5. i then deleted the inverse selection and did a stroke selection 1px