L'Oreal Paris Colorista 1-Day Temporary Hair Colour Spray, Pastel Blue Costume: Harley Quinn You can use the L'Oreal Paris Colorista 1-Day Temporary Hair Colour Spray, Pastel Blue ($9) and L'Oreal Paris Hair Colour Colorista 1-Day Spray, Pastel Pink ($4) to copy Harley Quinn's pink and blue-dipped ends. The spray is quick and easy to apply, and washes out after one day of wear. Just mist it toward the ends, in no particular fashion, to get that "undone" colourful look. Image Source: Everett Collection L'Oreal Paris Colorista 1-Day Temporary Hair Colour Spray, Pastel Blue $9 from amazon.com Buy Now L'Oreal Paris Hair Colour Colorista 1-Day Spray, Pastel Pink $4 from amazon.com Buy Now