Dude, it doesn't cost that much to buy credits at a pay site really. $30 @ Replace the Case will give you unlimited downloads for a whole year. You can download high quality customs and convert them to thinpak or ask the artist if they might do it for you. Some are pretty friendly and accomidating. For a limited time @ R1DB $28 will get you 400 credits. There's a heck of a lot of thinpaks and scans there to keep you occupied. Just think of it as a conversion expence.