A (relatively) easy as pie DIY shelving unit made from fir boards, threaded metal rods, nuts and washers from Ali of Design Public, over at Hatch.
Full instructions and fun process shots at the original post.
I love that this technique seems endlessly adaptable—to different shelf materials, different heights and shapes of shelf, and so on. A raw edge on the front side of the shelf boards? Yes.
What time does Home Depot close?