I've used Kap to screen record the animation for use elsewhere. Kap is a great, free screen recording app. Hope that helps. These new background art options are all dynamically generated so there's not really anything to download other than code.
For those asking about Hamburger thickness —
Adding this code to Custom CSS worked for me on 7.1
*Edit height to whatever you want, default is 1px
.burger-inner .top-bun, .burger-inner .patty, .burger-inner .bottom-bun {
height: 1px;
}