You can achieve darker colors with some deposit-only temporary dyes like Manic Panic, Pravana, Adore, Directions...
Also, consider getting fun colorful wigs and/or colorful clip-in extensions.
It's impossible to constantly change permanent colors without damaging the hair in the process, that's why I recommend temporary veggie dyes or wigs. If you want lighter colors than your current color, I'd get a wig, because it's impossible to get there without bleach and damage. But darker colors are achievable via deposit-only non-damaging dyes.
For curls, look up no-heat curling methods (there are tons!), like these ones by beautyklove: https://www.youtube.com/playlist?lis...26FAE04F57ED14
Wet-setting curling is non-damaging and you can get different textures every time (tighter curls, looser curls, "vertical"...). I would not recommend perms, because they are damaging, hard to grow out and also high maintenance (it's hard to keep them looking defined, you still need to style them!), so yeah, heat-free styling for the win!
Best of luck!
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