Even though it's your birthday, you might not be looking for a manicure that's bold and experimental. There are lots of more subtle and classic nail designs that are perfectly suited to special events, such as the trendy half-moon manicure. For the uninitiated, half-moon nail designs incorporate half-circle detailing at the base of the nail, usually in the form of alternate polish or negative space, as seen in the look from @iramshelton.
If you're wanting to explore more takes on half-moon manicures, we recommend taking a look at the nail sets from @polished_yogi and @themimid.