This is my real hair and I do it myself.
The red is Manic Panic Pillarbox Red. The orange is a combination of the Pillarbox Red and Manic Panic Electric Banana. The yellow is more Electric Banana. The blue is Manic Panic Shocking Blue mixed with Herbal Essences Tousle Me Softly Conditioner to make a lighter shade of blue (I would've used Manic Panic Bad Boy Blue if I'd had it). The green is a combination of the Shocking Blue/conditioner combo with Electric Banana mixed in. I would've used Manic Panic Electric Lizard if I'd had it, with a little Electric Banana to make it more neon. The lavender is Manic Panic Ultra Violet. Pink is Manic Panic Red Passion (it shows up pink on my hair).
I bleach my hair with Manic Panic 30 vol. and I usually only bleach my roots. In between dyeing I'll let the colors fade to pastels on their own so I can cover them up with new colors without having to bleach the majority of my hair.
If you want to know my haircare routine, I put it in the description of this photo: [link]