My "Effect" Accessory for Thor's hammer was made on Adobe Photoshop. I scanned Mjolnir for size. I took a clear photo of Mjolnir, removed background, adjusted position of strap and then repositioned 8 multiple copies in a 360 degree clock face manner to simulate the rotating spin. I then blurred it and reduce the opacity. I created a duplicate 2nd layer, reduced its opacity further and repositioned the bottom layer to create more of a spin effect. I then added lines to simulated the spin appearance. I then added a circle line to the perimeter and reduced its opacity. I printed it out on transparent plastic sheet paper and cut out the circle. I temporarily applied it to one side of the hammer with a small piece of tape. I hope it were sturdier but until it is ever professionally done by Hasbro or someone else, this is my effort.