In our future bed room there are two walls that jut into the space to support the roof. To avoid having sharp square edges that I am likely to knock my elbows on each time I pass them I decided on the ends of the walls being radiused.
I built up the ends of the walls with some timber and steel mesh to get the curve and then used bonding plaster to rough out the shape: Photo 1.
That was best part of 18 months ago, before I ruptured my Achilles tendon.
Then we plastered the rest of the room a couple of months ago, with the help of a friend, leaving the curved bits til last.
Today my friend came over and we took on a wall each and plastered the curved ends. I think the results are pretty good for a first time for amateur plasterers at 'not flat' surfaces.
My friend's wall: Photo 2.
My wall: Photo 3.