Some Ideas to Improve Morale

Smile and be cheerful
Greet others in the hall, ask how they are and what's new
Take extra steps to be nice and courteous
Have a team coffee break
Bring in lunch or breakfast
Share cartoons or jokes (in good taste) with others
Have a special day (i.e., Green Bay Packers day, Wear Your Favorite Team Shirt day, etc.)
Have a contest (i.e., cake baking, barbecue cook off, etc.)
Have an offsite meeting
Have an offsite event (go to the movies, go bowling, etc.)
Award performance with gift certificates and cards (most improved, hardest working, etc.)