When did you get yours? If it was before Labor Day 2009, then I think they have changed. Ours have the pattern all the way to the bottom (no white border at the bottom) and it appears to be shaped slightly different. We got ours (4 of them) last September.
If you got yours after then, then you must have a newer version than we do.
We just got 2 around Christmas, and they have the design all the way down. Those have been around for a while. I didn't want to buy them because I was afraid they would be changed in 2010. When we were there last weekend I didn't even go into the trading post, so not sure if they have changed in the last couple of weeks.