I collect small scraps of fabric in soft fruit plastic containers, keeping different colours separate. When I have sufficient, I 'scatter' the trimmings over a base fabric, carefully cover it with an appropriately coloured piece of chiffon (I use scarves purchased cheaply from charity shops), insert lots of flower pins through the layers to roughly hold everything together, and then use decorative stitches and free machining to trap the small pieces of fabric. I then cut the completed fabric to shape to make evening bags, etc.