Whenever I print or draw a game or activity, I laminate it, cut it out, and put it in an envelope. If it already has a picture or visual directions, I print that; otherwise I take a photo, print it and tape it to the front of the envelope. Then I put the envelopes in a magazine holder on my shelf. Voila, organization!
Two of my favourite sites for printable activities are File Folder Fun and Montessori For Everyone.