Bloody hell what a rude person that butterfly poster is!
OP is it deep bright purple - like a jewelly/amethyst/violet vibe, or deep dark purple, like a dusky aubergine? Do you like colour in general, what is your preferred style?
Might sound bonkers but I agree with some PPs above, orange is a good shout! I moved in and my study was already orange, a shade a few tones more muted than easyjet, but still pretty strong, I was going to change it……but honestly in a study it bloody works, it’s a nice combination of energising/stimulating and cosy/warming, as long as it’s not a jarring shade and staying away from being fluorescent! I’ve gone for deep colour elsewhere too with black furniture (desk, shelving and piano) and charcoal and violet purple elsewhere - not yet finished so can’t photo but planning woodwork/above high dado rail in charcoal, paisley purple pattern stencilled over the orange on one wall, can’t decide on the ceiling yet. Possibly the charcoal or violet up there, the ceiling is very high for quite a small room so want to bring it down.
Alternatively purple and green are lovely together - dusky aubergine with sage green, or violet and emerald.
Or go “monotone” and do everything purple but different shades everywhere. Lavender, lilac, violet, aubergine, all together.
I quite like the idea of starting with the bedding as the inspiration btw.