I want to dye my hair blonde?

I'm going to dye my hair blonde, but I hate having to re-dye it all when my roots come through, because it's too damaging for my hair and it's too expensive. My natural colour is quite a dark blonde, so I was wondering, could I pull off doing a sort of ombre look? I've been wanting to go blonde for a while, and so I've been letting my previous colour grow out for a while and now I have about 2-3 inches of my natural roots, could I pull off doing an ombre and only dying to the end of my new roots?

By the way, my previous colour is very similar to my natural roots because its faded so much, so I may be able to leave about 6-7 inches?

Do you think it could work?

Thanks