Still Nats for a quicky those are great. The spacing is right on The colors flow very well through the logo. The bottom left one grabs me as well. Not only are they simple yet effective, they also open up a door to page layouts and web page layouts. Good Job! I wouldn't mind seeing one inside a colored box but that is a personal taste thing.

Let's only hope your that good at all quicky erm . . . designs that you make.