In the forum of All you can scrap there is several challenges. It is a great forum and I recomend you to take a look in there.
I thought I would go for one of them, and my choise was to try the Color challenge for October. And of course I had to make a new scrapkit out of the colors.
This kit is a minikit and it includes:
The papers are 3600 x 3600 pixels and all files are saved in 300 dpi as png-file.
You can grap this minikit here or here for only $1.00.