You broke the back glass of your iPhone 4, but you’re not eligible for an iPhone 5 upgrade just yet. Maybe you forgot to buy AppleCare+. Yeah, you could go and get the back glass replaced for $29, but if you want to save some money and make your iPhone look unique while you wait for your upgrade eligibility you can try what this Redditor did.
Rather than buy a new back plate they added splashes of paint or nail polish into the cracks to give it a funky look. Who knows what will happen if that paint seeps into the components, but when your iPhone is already busted, you might as well throw caution to the wind and try something weird.