Wow these are all great! I Really like the form on the 2nd from the top and the 2nd from the bottom, very original. The colors on the top one are fantastic and I also really like the turquoise with the black w/white swirls.
All look great. I like #2 the best of the bunch, but would take any of them. I have been using flat aluminum (housing) sofit material on some of my pens and think it may be easier to use and a little thicker than the pop cans.