any ideas for perrinials coloured magenta, hot pink, bright pink

sidalcea, pyrethrums, lychnis coronaria, erigeron, echinacea, dianthus, centaurea dealbata, astilbe, bergenia, asters, anemone, alstroemeria

And geranium psilostemon

I have an amazing Lychnis called 'Firefly'...

Defo Dianthus - they come in all those colours! Don't think you can buy seed, but they are dead easy to propagate from cuttings - buy one plant now and you could have dozens by this time next year.