I don't think brown is necessarily boring. Or, for that matter, that regular is, or old. Likewise, I'm pretty sure hair isn't what makes anyone regular, old, or boring.
That said, it's kinda neat that returning to natural color would seem like a big decision -- is that about how you feel about yourself or how you present yourself, about how others might see you or interpret how you present yourself, about where you are in your life now or where you want to be...? -- but then, I'd totally believe your hair is capable of growing natural streaks of unnatural colors. =)