Send yourself flowers. Run barefoot through a park. Skip instead of walk. By practicing deviancy and learning to do things differently, you can get more pleasure and excitement from life. It may be as simple as changing the way you drive to work.
Tomorrow go a different way.
Leave earlier if you have to. Take the scenic route and see something different. Be open to the experience and see if it brightens your day. Do the same thing on your way home. Take a different path the one less traveled by you.