FOSS gamedev and creative worlds

I'm looking for a way to make a nice looking sofa. I tried stacking wool, but it came out obscenely large in comparison to the rest of my furniture. Anyone know of a good mod that has sofas, or a clever way to make one?

With just default mods, you can make a sort of bench by putting signs on the ends of a row of stairs. An improvement to that would be using vertical slabs from stairsplus instead of signs. 3dforniture has a decent armchair.