Lego is one of the greatest toys ever invented, but the shiny colorful plastic blocks mean that your Lego buildings don't exactly look very realistic. Now someone has done the obvious, by making Lego style blocks built from real concrete.
Etsy seller Studio 1015 will sell you a set of six bricks for $8.50 plus shipping, so if you plan to make something really impressive, it's going to get kind of expensive. Also, due to the rough hewn nature of concrete, these bricks don't have the super tight tolerances of real Lego blocks, so don't expect them to snap together like the real thing. Still, it might be cool to mix a few of them in with some regular Lego.