Well today I worked on solving a Lego Robot Challenge. Here are the bot's requirements:

1) Must be able to self-maneuver through a given "area"
2) Avoid Obstacles
3) Gather up 3 ping-pong balls of 1 of 4 colors (white, red, blue, black)
4) Reject all colors of another team(s)
5) Return with the most balls of your own color (lose points for wrong colored balls)

The bot isn't done yet, but I should be able to finish it tomorrow. Here are some of pictures of it.