Create a fiber optic jump rope by attaching two colored LED Flashlights at opposite ends of side glow fiber optic cable. The light travels in a straight line, blending the opposing colors within the rope, creating insane effects.

The flashlight: Zoomable Scalable CREE LED 3 Mode 200 Lumen 150 Yard Long Range Blue Light Flashlight Blue
https://www.amazon.com/dp/B0136RV6TC/ref=twister_B019KHT6PS?_encoding=UTF8&psc=1

The Side Glow Fiber Optic Cable: 10' 5mm Fiber Optic Solid Core Side Glow Cable Core Diameter 5.0mm Overall Diameter 7.0mm
https://www.amazon.com/Fiber-Optic-Solid-Diameter-Overall/dp/B00KISG3RI/ref=sr_1_1?s=hi&ie=UTF8&qid=1495635864&sr=1-1&keywords=5mm+side+glow

Connector Piece: PG7 Black Plastic Waterproof Cable Wire Glands Joints
https://www.amazon.com/gp/product/B01JYIV9BM/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

3D printed cap provided in STL file.