Buy a children’s umbrella — they’re the perfect size for one person & much cooler than plain old black.
Add a few drops of rosewater to your orange juice in the morning (from here).
Smile in photographs! I see so many people looking dour in pictures, it is so off-putting.
Take a day off work next week, & do something extravagant for yourself — get a full-body massage or a huge ice-cream sundae or just lie in bed all day reading library books.
Design yourself a business card.
Sing to your plants.
Stand close to someone who makes your heart race.