For background, a lot of times I need a vertical wall, horizontal bottom and a nice connecting curved surface between them in front of the camera. So far, I used two methods:
Deform a plane along the curve. Takes some time to get it right, as curve deformations a tricky. Almost impossible to make it truly horizontal or vertical.
Create a cube, add bevel, apply, remove unnecessary parts of the mesh. Bevel tends to have artifacts around the corners of the cube for large bevel values and number of segments (e.g 25% of the cube side length, 64 segments)
What do you use? Am I missing some basic technique?