Let's have some fun and start on the inerior. We shall start with a chair. In the front viewport, create a box with 3 length, 7 width and 2 height segs.
Now we have to shape it a little. Move vertices around and sculpt the basic shape of the seat back cushion. Do not make it perfectly symmetrical because that's unrealistic.
3DTotal
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Hold down shift and drag the geometry to duplicate it. Rotate the duplicate into the position of the bottom seat cushion.