This was my final project at school. It's black and white versus colored balls.
It was so nice to do, and at the same time it's a hell of a job. It's a lot of work! But the result is very nice. At first it was just a plate of mosaic, but I put so much effort in to it that I made a table of it.
It's not really hard to do, but if you want to have it shaped perfectly, it takes a lot of your focus! So that makes it a little tricky. Patience is required!