How do I get back to a more natural blonde? (pics)

that is great!!!!

It looks like your hair is three different colors to me.  Sort of Golden blonde on the ends, very pretty, a lighter golden blonde in the middle, and a neutral or natural blonde at the roots.  I think what I would do is try to blend your hair into one color by doing lowlights that would match your roots...although I am not sure what color to use...since your hair is so yellow in the middle try some strands with purple based dyes...maybe Dusk Blonde 93 DN...If you try this only color those strands that are yellow...use a 10 vol. and experiment with leaving the solution on for varying times.  The ends look a bit golder "redder" at least on my monitor.  Maybe some strands with ash or do the entire ends with an ash based dye...moon haze maybe...strand test it's really the only way to know for sure...Anyway, just ideas about what you could do. 

Thank you both so much for the advice. I read about the purple base shampoo and conditioner on one of the brassy tones threads and it sounded like it could be helpful, so I shall try that first. I've just looked at neutral blonde colouring products online and that looks like a colour I would be comfortable with, so failing the purple base stuff I'll attempt that (emphasis on 'attempt'...last time I did an all over dye-job I went a bit ginger!) Thanks again.

you could use a neutral color blonde....that might be your best bet.....i would use demi perm on your hair because it is just so much easier on your hair...demi perm will go darker so if you want to match your natural hair, go a shade lighter in neutral blonde and you should be ok....good luck on this....you know, you do have pretty hair.