I would have to estimate that I have bobby pins in my hair 5 out of 7 days of the week. I use them for straight styles, curly/wavy styles and updos. They are my go-to accessory in times of hair need. Although I usually use the standard brown bobby pins, there's a ton of options out there for trendier, cuter, and more adorable pins, many of which you could probably do yourself!
I found these adorable ones on Etsy (bought them): 2 per pack in colors of your choice.