I made this to get more familiar with how neural networks work.
What the program does is randomly pick a color and, based on its training, decides whether white or black text looks better over that color. It's trained with a back propagation algorithm and as for the dataset, it picks a random color and decides whether the text should be black or white using this formula: if R * 0.299 + G * 0.587 + B * 0.114 is higher than 150, it's black, else it's white.

It finally works oh man, that's important. I'm pretty proud.
you can mess around with it here