Pretty invariably, I have my subs send me a daily journal with a brief summary of their daily activities and thoughts, particularly thoughts related to tasks I had assigned them. I usually also requested picture "proof" of various tasks. Aside from that, it really depends on what turns the sub on. A few samples of things I'd done in the past include:

- Get my permission every time they wanted to use the restroom (although it forced me to be online frequently for the duration)
- Send me revealing pictures in semi-public areas (Elevators are a favorite of mine because they're relatively safe while making the sub very nervous)
- Go a whole day (weekend obviously), pretending to be a dog
- Masturbation games
- Have a quota of fantasies to write out and put online