Alternative ways of lightening hair

I've been pretty good for the last year and a half, only dying my hair with semi-permanent vegetable dyes. However I'm always looking for a way to do something different with my hair. When I was 13 I ruined it with black dye and my golden blond has never been the same.

But to my surprise, this summer my hair actually started to lighten in the sun! I helped it along with a solution of camomile tea and a small amount of lemon juice in a bottle, which seemed to work ever well and the lemon juice didn't seem to dye out my hair that much.
But now it's winter, and I live in good old England, my hair isn't getting exposed to any sunlight and so at the roots it's quite dark again. This got me thinking about using honey. I've heard it works for lightening and it's good for moisture unlike lemon juice, but I'm still to find a technique which has worked for someone...
Nevertheless, I like the idea that I might be able to lighten my hair with something natural. The only other option I see right now is henna, but that's really a permanent thing and after being 'addicted' to permanent hair dyes for so long and knowing myself and how short my hair colour attention span is I am kind of frightened to do henna. Plus, I'm only just starting to like my natural hair colour, or rather, the flexibility of it...

How you tried honey lightening and how did it work for you?

Thanks for reading :)