From the glittery homemade cards we assembled in elementary school to the cringe-worthy gifts we crafted for our first loves, Valentine's Day and DIY have always gone hand in hand. And just because we're all ostensibly grown-ups now doesn't mean the fun has to end. In fact, on an ultra-commercialized Hallmark holiday like this one, we think there's nothing cooler — or more genuinely romantic — than something you took the time to do yourself.