Since I often forget to perform RC's throughout the day, I simply draw a small, yet interesting symbol on my arm, next to my watch, with permanent marker. This means that every time I look at my watch during the day, I see the symbol, and do an RC. I keep it updated by constantly going over it with marker when it runs out (probably not the best thing for my skin). Pretty simple, but helps me a lot, and is also quite a unique and interesting way of performing an RC.