Colors

I don't think you have to add an additional color unless you want to. I agree with Chrysta with adding cream / or white (but I kinda assumed you may have already)... If you want a "pop" of color, how about a soft pink or rose?

I agree, cream or white will be a nice pop, but if you want more color I'd do a light pink. Maybe like riceflower or astilbe

I think white would be nice in there to lighten it up more

I think white & cream would be good to add. I wouldn't add another color.

Maybe a bit of greenery.. It's recommended to decorate in colors of three. Depending on the season, you may want white or cream, and one flower that sort of pops - lighter or darker than most of your bouqet. I have found wedding wire has great photos for ideas, Pinterest of course, and Martha Stewart weddings online (free), also. Oh, and the ribbons that flow from the bouquet, I find beautiful. I'm thinking of a velvet one for my Autumn-time wedding, and I like when it's a different color than the bouquet. So many creative options! Good luck.