If you're bored with your hairstyle and want to update your look, you have a lot of choices. Sure, you could get a fresh cut, add highlights, or even darken it. But sometimes you want something new, something you can't grow or dye. When it comes to these wants--the super long, extremely thick, and extensively colored--you need hair extensions. Here's the scoop on which locks you can dye, what application method is right for your hair type, and how to get the look at home.