Show off the fun and interesting ways you use stone, rocks, concrete, or cement in your projects!

First time posting a project on Instructables? You could win the First Time Author Judges' Prize! So if you haven't shared on Instructables before and were waiting for the right moment, this is it!

The Stone, Concrete, Cement Challenge is closed.

Grand Prize


Judges' Prize - First Time Author


Judges' Prize - First Time Author

One Judges' Prize Winner for First Time Author will receive:

Grand Prize

One Grand Prize Winner will receive:

First Prize

Three First Prize Winners will receive:

Second Prize

Five Second Prize Winners will receive:

Runner Up

Ten Runner Up Prize Winners will receive:

Write an Instructable

Create a new Instructable that fits the guidelines outlined in the contest description above. To be eligible, Instructables must be published between Jun 28, 2021 and Jul 26, 2021 (11:59pm PT).


Upon publishing your Instructable you'll see checkboxes for open contests. Select Stone, Concrete, Cement Challenge. If you have entries currently eligible for entry, it will also show up by clicking "Enter this Contest" on the right side of this page.


Entries are accepted by Instructables staff within one business day Monday - Friday. What matters is the submission time, not acceptance time.


A panel of judges made up of Instructables staff and respected members of the community rate the finalists. The averages of the ratings determine the winners.


When the winners are decided they will be notified and announced here on the contest page.