On Furdle's Server, there's Drug Bricks that you can get as items. You can do this in the Salvage Gamemode, where you destroy a brick and can replace it. But what I want is exactly what Furdle has, but it can work with things like the Boards brick (
http://forum.blockland.us/index.php?topic=266900.0 ) as Barricades!
If this were to be made, the bricks would have to spawn with some way to remove them; like, to make it so if you click the barricade then you destroy the barricade and get the Barricade into your inventory.