Blockcraftery

Description
Blockcraftery adds a set of recipes for creating blocks in additional block shapes, including slanted and angled blocks. First build a set of frames, then use the frames in recipes to create special block shapes. Decorate the frames with any existing block texture to get your own placeable custom block.

Links
http://www.9minecraft.net/blockcraftery-mod/

Mods
FTB Horizons III