Remember how I told you people, one of my best friends enjoyed all the attention she received when she had a haircut. Go in for something different and flaunt it. Your attention would instantly shift from being sad to looking at the glaring faces. Choose what looks good on you and enjoy.
Flaunt the dresses which you have not used more often or which you save for special occasions. This will also help you in ignoring your low feeling and get you into the groove.
Sometimes changing the colours you wear can also change your mood. For example sporting a floral print dress is summer can cheer you up as well as people around you. So flaunt the colours and prints accordingly and keep away your blues.
A very well known therapy to beat the blues :D. Money cannot buy happiness but then who believes in this saying?! And with shopping you can always bring a smile on your face. Humans love materialistic things. So go on a shopping spree if you as feeling very very low.
Makeup works for some girls very well. Am not a makeup junkie but just using a different lip balm cheers me up sometimes. So I can imagine the effect of trying the whole makeup and what effects it can have on your mood. So go and flaunt the makeup you always wanted.