This site provides free activity ideas to do at home. The site also breaks down activities by "skill" which can range from in-hand manipulation and writing to visual perceptual skills. Each activity is shown with a picture to make it easier to understand the final product.
This site provides practical tips and tricks for parents regarding occupational therapy activities. Occupational therapy is also explained very well as well as sensory processing disorder and what it is.
This site provides information on what occupational therapy is and provides various DIY activities that you can do in your home. The author also breaks down specific skills that are focused on in therapy sessions.