Three arcs rotating, the middle one emitting light and sparks. Nice logo, or "loading screen" sprite.

Note: You'll need to re-bake the particles, and any change you make to one particle system, you'll need to make to the other two to preserve the looping function. I chose frames 161 to 280 to render, as it starts and stops when the middle arc whizzes closest to the camera. Not a huge deal, I just found it made for a slightly smoother transition between loops. Anyways, enjoy!