For me it's easiest to have them in strips, squares or triangles. That way they can fit together easily without a lot of trimming as you go. There's still going to be some trimming required, but if the pieces all have straight sides you can go much faster.
So far I've only done pillows with scraps, but I was very pleased with the way they turned out and the fact that they used up most of the smaller pieces of that particular set of fabrics.
Hope I can get a good picture of them.
one side of pillows
other side of pillows-one on right not stuffed yet