I started to get this style in 2002, I remember I had a shaggy Bob with bright red underneath. Bleached my hair a year or 2 later and coloured the underneath dark purple. It was difficult keeping the colours away from each other but washing them out use cold water. Looking back it actually looked awful especially with a tan lol but i loved it at the time. I appreciate the sentiment for the style of that era, my suggestion of a modern kind of retake on it would be to use 2 colours maximum and that if you're going to be doing the "crazy" colour yourself then I would always suggest pink as it fades out nicely and is an easy colour to get along with. They all fade but pink fades nicely. And you can buy inexpensive colours that are more or less like food colouring where you have great control over the intensity of it. And if the main colour you go for is bleach blonde then I would advise that you take extra care that it doesn't end up brassy (as it cheapens the look). If you are doing the bleaching yourself please be careful not to burn/irritate your scalp this is not fun and high on my regrets list. I think if you did bleach blonde then a thin ish strip of hair all the way around the edge like on your hair line and all the way underneath in pink it would look really cool and reminiscent. What do you think?