This DIY project transforms ordinary black corrugated plastic downspouts into robust, heavy ridged blocks using cement and a couple of common supplies. These blocks can serve as unique decorative pieces or functional items like bookends, planters, or doorstops. The process is straightforward and allows for creativity in design, making it an appealing project for those looking to add a personal touch to their home décor.
The finished DIY blocks can be styled as statement pieces in a modern living room. Place them on a minimalist bookshelf or use them as unique bookends. For a cohesive look, coordinate the blocks with other black or gray elements in the room. The blocks' industrial and textured appearance pairs well with concrete or metal accents, adding a contemporary edge to the overall aesthetic.
Cement-Filled Corrugated Blocks

Materials
Black corrugated plastic downspouts, cut into 6-inch sections (3 pieces)
Quick-setting cement mix (enough to fill 3 downspout sections)
Mixing bucket
Stirring stick or trowel
Plastic sheet or tarp (to protect the work surface)
Directions
Prepare your work surface by laying down a plastic sheet or tarp to catch any spills.
Cut the black corrugated plastic downspouts into three 6-inch sections. Ensure the cuts are clean and straight for a stable base.
Mix the quick-setting cement in a bucket according to the package instructions. Stir until the mixture is thick and free of lumps.
Carefully pour the cement into each of the cut downspout sections, filling them to the top. Tap the sides gently to remove any air bubbles and ensure even distribution.
Allow the cement to set completely. This may take a few hours depending on the brand and environmental conditions.
Once the cement is fully cured, the blocks are ready to be styled and used as desired.

Variations & Tips
Consider experimenting with different cutting angles or lengths for the downspouts to achieve varied heights and shapes. You could also add color to the cement mix using concrete pigments to match the blocks with your existing décor. If you want a smoother finish, lightly sand the exposed cement surfaces after they have fully cured. For added functionality, insert a small plastic container into the cement while it's still wet to create a planter cavity.