You can find out all about Bijou and his new 2"X2" tiles (also called Twinchies) here.
The challenge that Laura issued was "Be like Bijou". In other words, think small. You don't need to have official Bijou tiles; just work in a small 2X2 format. Of course, working that small, it's hard to stop at one.
Lower left was done for "It's a String Thing"; upper right for "madebyjoey"; the other 3 were done specifically for this challenge. And I'm probably not through yet; this is fun.
As usual, I urge you to visit the Diva's site to see the other wonderful entries; it's amazing how different all the responses are. Maybe you'll be inspired to try out one of the Challenges yourself.