Just found these 10 Rules for augmenting the fun and beauty when designing interaction:
- Don’t think products, think experiences.
 - Don’t think beauty in appearance, think beauty in interaction.
 - Don’t think ease of use, think enjoyment of the experience.
 - Don’t think buttons, think rich actions.
 - Don’t think labels, think expressiveness and identity.
 
These were taken from the Funology book: “Let’s Make things Engaging” by Overbeeke et. al.