It's kind of hard to tell from just the short preview, but I thought it looked cool. Not any weirder than the pink or blue..
But really, if you think about it, we're bound to see every color of the rainbow eventually. The costume designers for this show have a HUGE job coming up with new disguises that don't look too much like something she's worn before. The longer the show goes on, the harder that would be. Just look how many variations on the red and blonde hair we've seen already....I guess that's why they keep Syd's natural hair color that sort of light brown...So all the wigs look more dramatic compared to it. I predict that the next "wild" color we'll see will be green.