UI Image UV rotation/Highlighting border

Hi folks so I've been playing a bit of WoW lately and found an effect which I find interesting and seen other games use too which I really want to reproduce and use in a game. the effect can be seen in the video below at 0:20 and again at 1:15

There is 2 effects happening in the bottom on the "actionbar", the scaled up "explosion" which I easily could reproduced with a scripts, but the one I find the most interesting is the "scrolling"/rotation border which I've used 2 days now trying to figure out how can be reproduced.

I've tried with a rawimage ui element and played with the UVs there but that didn't really give the result I wanted as seen by the images below... I've also looked at some shaders which none seemed to work.

https://www.dropbox.com/s/664gigvz9mbih7b/Skærmbillede 2017-03-25 12.18.35.png?dl=0
https://www.dropbox.com/s/36nkvt74r7p5n0u/Skærmbillede 2017-03-25 12.18.48.png?dl=0

I'm also a little picky here, I'd prefer to use a 256x256 images, which can be reused for other thing than just the achievement screen shown in the images as I have som other places I want to make similar effects.

I would greatly appreciate any help I can get and hope there is some smart heads out there.

Thanks - Jackie