I am doing the beautiful beginnings theme and had the option of magenta or white flowers. I've also seen pictures of the white flowers... so I think its definately an option. I wasn't too thrilled about the magenta either, but I think the white is really pretty.
Like the other girls have said, everyone goes through this... you just can't it get to you. The day is about you and your FI, do what you guys want!! In the end everyone who can make it will and they will all enjoy themselves.