Sometimes it really does come down to the simple things, an individual thank you goes a long way.  Most people are at their best and feel most valued when they are given a chance to learn and grow. Are you creating these opportunities?

Often quoted motivators such as giving people the opportunity to do what they do best and being really clear on what is expected of people are often overlooked.   Helping people be clear that what they do matters and where it contributes to the company goals and strategies often makes people feel more valued than plaques etc.