Here are two mosaics of the same image using two different techniques of generating the pixelated image.
About this creation
Here I was experimenting with different quantization techniques. The one on the left created more solid areas of color and only has a few colors. The one to the right uses a dithering technique to simulate many more colors. I like the one on the left myself. The color one was disassembled a few months after construction - those 48x48 bases aren't cheap! :-)