Dyeing hair unnatural colors with natural dyes?

I know that it would be easier to use Manic Panic or something like that, but I don't want to damage my hair in any way. I'd like to add blue highlights or lowlights using red cabbage. I understand it will not be permenant and that it will wash out fairly quickly--I can handle that :) I also understand that vinegar can help seal it in? What can I do in order to help the color last a teeny bit longer? I have dirty blonde hair...with a slight reddish tint and many natural highlights. Part of the reason I'm so attracted to the idea is that I can just wash it out if I don't like it. I've never dyed my hair before nor do I use any products except for shampoo. Any experiences/suggestions?
 
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