Surfacedesign, Inc.'s cardboard wall - cardboard installation for journey forth. Maybe try this with toilet paper rolls to reuse instead of trash.
12 Amazing Things Made With Cardboard Tubes. This would be an awesome STEM project for kids!
Tubos de cartón - lamparas de cartón
You can make simple chairs out of pile of tubes - a wooden, plastic or plywood frame will be necessary. Here chairs made by professional designers: Lounge Chair, With a plastic frame, Chair By Manfred Kielnhofer.