When I asked my dad about gratitude in the workplace, he first simply said "well, we say thank you to each other!" He explained that, to him, actions are a better measure of thankfulness than any word.
He went on to tell me that he goes out of his way to help and accommodate the preferences of his coworkers and his manager, being flexible with vacation days and different shifts. In turn, his colleagues do the same for him, switching around their schedules to allow him to take a vacation to visit his mother in Lebanon this past summer.
Each individual banker has a sales goal that must be hit each month. When my dad hits his goal, he tries to funnel customers to his colleagues so that they also will hit their goals. He is good with people, so he uses his gift of gab to help his teammates achieve their goals.
Not once did my dad mention that he felt taken for granted. This reciprocation of good deeds and extra effort seems to be how his workplace expresses gratitude, and it sounds like it's working well!