Hey sis
I tried dying my hair cobalt blue last week.

What a disaster! Turns out my hair is just wayyy too dark, you're so lucky you're blond so you won't have to endure a bleaching nightmare.
I bleached my hair twice, for HOURS. Even tried dying it twice, ended up looking like a friggin mermaid, with shades of blue ranging from Cobalt at the roots, electric in the middle and aqua at the ends!
I was not a happy camper and dyed it black the next day. I was actually in tears, been wanting blue hair for years, but corporate environments generally frown upon it, so I figured I work for a salon, I may as well... only to look like a mermaid in the end.
I agree, if there's no policy that says your hair can't be blue, go for it! I think you'd look stunning and can't wait to see the pics!