I just tried to add custom screen saver pictures and they aren't showing up. I made .png copies of them and adjusted them to as close as possible to the dimensions listed. I put them in the screensavers folder but I still get the hack successfully installed page. I have read over the instructions a few times and I don't see what I'm doing wrong.
I was trying the book cover mode but I deleted the "cover" file to make sure that wasn't causing any issues.