Have a lot of buttons, all colours, shapes and sizes in a bag or bottle? Collect the little plastic containers from a photo developing shop (clear ones), stick little round stickers on top and colour them with Koki pens. Fill the containers with the buttons, pack them in a flat box. If you want to find a button, just look inside the box, look for the colour you want, take it out and select the button suitable for the job. Saves time.