For your sitting pleasure, hand-made cushions. To place them, use the 'moveobjects on' cheat. To place them plentifully, use the 'boolProp snapObjectsToGrid [true/false]' cheat also but remember to turn it off again (note how I've used this on Kathy's lovely bench).
You will need the mesh from http://mangosims2.free.fr/meubles.htm for which I thank Mango-Sims - go to Meubles > Bureaux > down to Set Solo and download 2 coussins. I have used the gros-coussin-mesh, which is the larger cushion mesh.