DIY Geometric Concrete Bookends


eHow Home Blog


With the help of recycled cardboard and quick-drying concrete, these modern bookends with high-end appeal are budget-friendly and easy to make at home.

How to make geometric concrete bookends_eHow

Things You’ll Need

  • Cardstock
  • Ruler
  • Scissors
  • Corrugated cardboard
  • Utility knife
  • Duct tape
  • Quick-drying concrete
  • Water
  • Mixing bucket
  • Trowel
  • Gloves
  • Sanding block

Working with concrete: Look for a quick-drying smooth concrete or cement mix at your local hardware or craft store. This project would also work well with plaster or other agents, such as mortar, depending on what you have on hand.

Equilateral Triangle

Cut a 4-inch equilateral triangle from a piece of cardstock. This will be the guide to draw the mold template.

Tip: Cutting a larger or smaller triangle will result in a larger or smaller bookend than ours. Get creative to suit the needs of your project or space.

Using the triangle as a tracing guide, draw out the following template onto a piece of corrugated cardboard, such as an old box.

Geometric Mold Template

Tracing Triangle

Cut out the entire shape from the cardboard.

Geometric Concrete Mold Template

Using a ruler as a guide, score the top layer of cardboard along each of the lines, using a utility knife. The goal is to make for easier folding, not to cut all the way through the cardboard.

Scoring Cardboard

Once scored, bend and fold each cut in the cardboard to shape into the geometric mold.

Scored Cardboard

The mold will come together by joining the outside triangles.

Geometric Cardboard Mold

Secure each folded side with duct tape. If making two bookends, repeat the steps to make two molds ready for filling.

Taped Geo Molds

Because these next steps can get a little messy, bring the molds out to the garage. Mix quick-drying concrete with water according to the package directions in a well-ventilated and easy-to-clean area. Scoop the concrete into the molds, patting down the sides every so often to make sure the mix settles all the way down evenly (as you would with a baking pan when making cake or brownies).

Concrete Molds

Tip: Concrete can be tinted, if you prefer a different shade than the classic grey, incorporate dye during the mixing process to achieve desired hue.

Drying Concrete Molds

Rest the molds face-up atop of paint cans or mixing buckets to set and dry. Allow the concrete to dry according to the package dry time, but move onto the next step when the concrete has set to shape just before it’s fully dry. Removing the mold before the concrete fully dries will allow for easier sanding and faster final drying time because the bookend will be exposed to the air. You’ll know when the concrete is almost dry when the center looks light in color and the edges are pulling away from the mold but it’s still a bit dark from retained moisture.

Molded Geometric Concrete

To remove the mold, gently peel away the tape and cardboard from the concrete. The shape will be rough at this point, retaining the ridges of the cardboard, and may have small bubbles or other imperfections.

DIY Concrete Mold

Sand the surface and each edge of the bookends with a coarse-grit sanding block until smooth.

Sanding Concrete

Wipe away any excess dust, and allow to fully dry before bringing inside. At this point, we were happy with the natural surface of the concrete shapes, but this is the perfect stage to apply 2-3 coats of acrylic paint to a single facet or the entire surface for a bright update. Metallics, whites and blacks are all modern shades that pair well with most decor.


Rest the largest flat side against the books, and marvel at the modern architectural feel they introduce to your space. We chose to rest ours along the exposed shelf we recently built for our kitchen, and they’re doing a superb job of keeping our favorite cookbooks within arm’s reach.


DIY concrete projects are oh-so-of-the-moment! You can use the leftovers in your bag to make stepping stones molded in old cake pans and these cool garden planters using recycled milk carton molds. You could even use the same template in today’s project to make paperweights — just use a 1-inch triangle to draw the template.

Mary & Tim

More from Tim and Mary

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Keep up with Mary and Tim’s adventures in DIY, home and gardening on their collaborative lifestyle blog, 17Apart. Find them on Instagram (@17Apart) and page through delicious recipes on Tim’s food blog, E.A.T.

Photo credits: Mary & Tim Vidra

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