This is a brilliant idea from Heidi Lehto. You can turn an old cassette tape case into a photo frame. All you have to do is to mount the case on your wall with screws, and put your favorite picture on it.
The beauty of the idea is that the case is a hiding storage for such small items as business cards. One stone, multiple birds: you can reuse the old stuff, make a picture frame wall art, and a mini storage space… Very creative!