Maya from Borderlands 2 has a very specific hairstyle and color. Her tresses are an icy blue, and it’s tricky to match to any existing style. Cosplayer Nebulaluben bought a wig that was close to Maya’s style, but she decided to cut and dye it to make it a better match. She only used 70% rubbing alcohol and permanent markers to achieve the desire look. She describes the process:

I bought a pair of Edding markers, one dark blue and one turquoise. On the other hand, I filled a bottle with diffuser alcohol.
I opened my pen, I took the sponge inside them and filled it with ink, I cut a couple of pieces and immersed in alcohol.
Depending on the intensity of color you want, we can dissolve more or less ink on alcohol. I was throwing bits of sponge until I saw that the wig was dyed acceptably.
I was spreading the mixture with the diffuser on the wig. The difference is small, but I think I got a more vibrant tone.

Read more at Nebulaluben’s blog, top photo by AOJ.