PVC Tunnel

• Bending PVC Pipes: (Use a hair dryer and 1/2-inch drain auger)
• The drain auger is inserted into the PVC to prevent it from kinking as it's being bent–kinked PVC pipe is extremely difficult to get straight again. Use a hair dryer to heat up a spot on the PVC pipe and slowly apply pressure on the area you want to bend. Once you've made a bend to the desired angle you can remove the auger. This technique is ideal for maneuvering PVC around corners and over other pipes, while remaining flush to the wall. Take it slow when heating and bending the PVC and you'll have a successful outcome almost every time. 

(Material: Nylon Rope)

Using Yarn as one of the Textures would be a good idea, However the Yarn will most likely, unfortunately, not last very long outside. It might be a better Idea to instead Nylon Rope instead of Yarn, as it can still be colorful, have a Similar, or close-enough to similar, texture, & is stronger than normal Yarn.