I don't know about the UK, but back in the 90s American kids used to dye their hair with Kool-Aid. (I also don't know if you have Kool-Aid - it's a technicolor powdered drink mix.) Anyway, everyone I knew would walk around with green or blue or purple hair and their plaid flannel shirts and pretend they were grunge rockstars from Seattle.

So far in my life, I've noticed that trends tend to come back in style every 20 years or so - so things that were popular in the 80s are back in fashion now. If you wait at least 2 years to have a kid, you could tell everyone that your kid is hip and retro and everyone will think you're frickin' awesome. Rock on!