The sample looks great and I bet it fits perfectly as a PSP background.
I haven't looked at the other images yet, but I'm downloading the package.
OK, I've seen them now. They all look very good, but I have a few advices for the new pack:
Can you try to variate the images a little more? Some of the images were the same, only altered a little. Or, it's fine that you make the same images with a few alterings, but maybe you can add more images (I mean motives, sort of) instead?
Also, I would like some of them a little brighter, because I think they are a little dark.
I really want to see a second pack, so I hope you do it.