Remember the obssesion with hair chalk?
Remember the obsession with Flash Tattoos?
Put them together and you have (what will be) your new obsession, hair tattoos. Just like your typical Flash Tattoo application, you apply these to your hair with water. Plus, they wash off easily, so there's no need for long-term commitment and unlike hair chalk, which is almost impossible to see on dark hair (unless you colour it in for hours), this works best on brunettes.
Don't just take our word for it. Kylie Jenner recently worked a gilded arrow design on her silky, smooth hair, looking all kinds of amazing.
A few things to note though; firstly, you need have poker straight hair, so run it through a straightening iron prior to putting your tattoo on. Secondly, make sure it's completely transferred before you lift away the paper. Slowly does it. And finally, if you want it to look as good as it does on Kylie, you'll need to mist over it with hairspray to keep your hair from seperating.
Think of them like the grown up version of iron-in hair charms.