Carpenters Block is a Minecraft mod available for versions 1.5.2, 1.6.2, 1.6.4, 1.7.2, and the latest is 1.7.10. Similar to the Chisel mod it makes building much more customizable.
Carpenters Blocks adds a set of Carpenter items including Carpenters Stairs, Carpenters Slopes, Carpenters Doors, Carpenter Barriers, Carpenter Gates, Carpenters Trapdoors, etc. All of these are normally Minecraft items with the exception of Wedge Slopes. When placed they have a really boring texture of brown. But if you grab a block and right-click on the Carpenter Item, it adapts to that block but staying in its form.