After a few succesful 'outdoor' renders using the sky lights as per the tutorial, I want to do a few interiors. One thing I'm having trouble making is a good looking indoor lightsource.

I can make point lightsources, but they have sharp shadows and don't look very good. If I try using the 'white plane' lightsource as used in the render tutorial in the wiki, then I get wierd grainy effects if I use them on their own to light things.

Does anyone have a good technique?