3 things that always brighten me up, when i have a little down phase during the day:
Bright colors - especially playing with them - like music
Fresh coffee - not much of it, but an espresso can really work magic sometimes ... and it smells so good, too!
Deep breathing - i like to stretch with my arms up, deeply filling my lungs - yes! Every 20 minutes is good, especially during computer work.
Have a bright and lovely start to your week flowers - and - let's dance!