I’m big fan of shelving units made of pipes. They have so great mid-century industrial-like look that they fit many interiors very well. Dosuno Design made a step further. They created an open source platform for plumbing pipe furniture. That’s much more cooler that other DIY projects that involves pipes. You can download a pdf download and press kit with simple blueprints and instructions on how to build their versions of industrial pipe furniture from their website.