3d printer filament recommendations please

I bought an Ender v3 S1 before Xmas and it's fantastic. (Thanks to HotUKDeals)
Been using esun PFA+ with truly excellent results.

Can anyone recommend some other filaments specifically for gold or the rainbow, metallic colour changing ones? (Basically good jazzy looking filament that works as my kids use it too )
I tried some gold PFA but the results were poor no matter what and ultimately brittle too.

Thanks In advance.