Here's a pic of my one and only side project made for a friend. Unfortunately it was not all DIY, as I don't know how to sew currently, a fellow furniture builder helped me there. I did design, build and upholster the thing though. The idea I had at the time was to get some 3D "slime" on a a sofa, which turned out pretty interesting and pretty difficult and time consuming. The arms are detachable and ya might notice piping on the back pillows but not on the cushions-Imfigured it'd be too much green.
If anyone has upholstery furniture related questions, I'll be happy to chip in. I work in a shop that produces all kinds of pieces.