Anybody have any ideas for a punk/goth hair style or hair cut?
My hairs platinum blonde with black underneath

Are you going to get it cut? If you get it shorter you could go all over a magenta colour and let your dark roots grow in - this looks pretty cool. Go for a really choppy cut.

Or if you keep it the style in your photo perhaps pinky/purple tips with the blonde

The punk and goth look are similar. The unnatural neon colors for these looks are blue, orange, pink, green and red. Blonde and black streaks are popular among teenagers. The hairstyles are also edgy, some of the haircuts are jagged and asymmetrical (uneven), or spiky. You should choose a color and style that makes you feel comfortable and happy.