It sounds cute but with blonde hair you'll have to be careful, even after it fades it might leave a slight tint. When i still had my natural color, blonde, i dyed the under layer black and when it faded it was hard to get out, which is why i dyed my hair brown...and now i have it black with red on the under layer :) good luck tho, it sounds like it'll be cute!!
and then i notice a girl in my school get blue tips. xD
but why on earth is this a top quote :3
DON'T DO IT