Oh heck yeah! Welcome to having dyed hair! In my experience it worked out far better than I expected. I went "purple" but it quickly went pink, which turned out to work almost better. A partial dying is probably smarter, easier to cut it off if you have to, but I think you're going to enjoy this.
I actually used to wear it dyed back when I was in the cage, back in 02-08. It was teal stripes instead of blue, though. I just missed it. I was worried that I'd be too old and fat to pull the look off, but it seems okay, and makes me happy.
The cage?
Maximum Zero had an MMA career. 
True story. I was never like, a pro level fighter, more like a...high-level-amateur/extremely-low-level-pro type. A fights-mostly-in-warehouses type. A maybe-500-people-crowd type.
But yeah, I went 78-12-0-1 over 8 years. Scored 66 KOs and 8 Submissions. Sometimes I was fighting every week. Fought in a lot of tournaments that aren't counted in that tally, as well (but that was closer to 15 years total.) Last time I counted, the tally was over 300 bouts. I was extremely self-destructive back then, and boy did my health implode spectacularly, but I still miss it.