At work, there is a "recognition" whiteboard. Team members are encouraged to write a message of thanks to another team member, recognising something positive that person did or said etc. The messages build up over the day and during breaks, I've witnessed many people standing in front of this board and reading the messages. They'll hi-five their colleague or give them a pat on the back as well. Some of these messages are selected and read out in the morning at the team meeting. It's little things that can make a huge impact.