UPDATED: Good thing I still have this photo of "before" covered with that Harry Potter bag fro the park. Some people asked me how... here's answer-
Actually I visited the park and bought things. They put my items in bag. That is the bag. I just keep the bag... arrived home... I knew there is no HP album then I thought up of cut from my bag. I have two... one for keepsake and other cut and cover front of plain black album. That's it. The park have different size of bags. They use big one for my stuffs cuz I bought wand, etc.
just cut bag and use double side tape to cover it to album... I did front side only... none on back side... do like gift wrap then tape or glue white 12x12 to hide bag edge inside front side.