Map IP to unique creative identifier
I would like to create a system where people can post messages without registering. Rather than showing their IP address to identify which message belongs to a unique person, I would like to somehow map it to a creative/non-technical solution. For example, I think I saw somewhere someone doing it to colored boxes. So when I would post a message, in the left column would be 2 different colored boxes and in the right column would be my message. The next person posting from a different IP would have different colors. Can anyone think of any other ideas to solve a problem like this or know of any premade PHP code that might do this (for colors or equitable solutions)?