I read somewhere to treat your birthday as a day of how you'd like to see the rest of your year going - meaning - fill it with activities you'd see yourself doing in future. So every birthday now, I do stuff like; going to the florist's, eating a fresh loaf of garlic bread etc. etc.
Last birthday I accompanied a friend to a jewellers', she wanted to adjust a bracelet, I wanted to be around shiny things. I learnt about the silver market, got a discount for my friend and tried on lots of pieces for the heck of it. Also went to a buffet later, unscheduled. In the mundane, there are always beautiful moments.