concrete

And by "tools of the trade," I mean these guys' supervisors.

From the submitter:

"Had some left over bricks and needed a seat to contemplate my next project."

Consider construction contemplation complete!

Almost as dangerous as the stairs of Khazad-dum. ~Not-So-Handy Andy

Instead of actually filling the potholes, just throw a bag of powdered concrete in there! Genius!

Uh oh, here comes the foreman to check out your work. ~Not-So-Handy Andy

"I've got the most brilliant idea! Instead of people driving on wheels, why don't we just make the roads themselves out of tires! Brilliant!"