Activity for Lanelle

So my wedding is coming up within the next 2 weeks and I have somewhat of a dilemma. I asked my niece and Goddaughter to be flower girls, one responded right away and the other just got back to me (the parents that is). I had picked out a simple...

I know it's my own wedding and can do whatever but should a flower girl dress always be white?! I fell in love with this dress as soon as I saw it. But I'm wondering if it'll be too much. (My colors are blue and orange) the BM/ jrs will be in Royal...