Hello, I would first discuss with your clients if they are happy with this look. I have got clients who have gone for this purposly because they like the all over bleached look, with out having to have a block colour and its much easier on the re growth etc too. If the client is not happy with their "white" look, I would discuss with them what they want to be done about it, do they want some of their base colour back, or say a couple shaded lighter than base?? Do they still want the blonde look, but a bit more natural, I think it only looks false if you go to dark with the other colour and/or do the hi lights too chunky, eg bleached hi lights with say a base 5 is going to look unnatural, but with a base say 7 or above with a very fine weave, and maby a couple more colours in the mix would look more subtle. I would not colour over the whole head and re hilight, no way, think of the breakage of re bleaching over all that old bleach. I would add another couple colours and weave realy fine on an angle so as not to make it stripy. Discuss with them what they want, you never know they may all be very happy witht he look they already have xx