Jenelle gave me four things to work with: Brown, turquoise, elegant and, lilies so I’ve come up with two options for her. 
(Just a note before we get started. I added orange because sometimes when the theme only has two colors the colors get over used and there doesn’t end up being enough texture and diversity to the decor. I always like to group colors in threes, it seems to work out best as to not go over board with just two colors and to add a bit more for the eyes to enjoy!)

Option One: A little classier
(Change the color of the sash to match any color theme you want!)
A little color in the centre pieces to brake up all that brown
Option Two: Something a little more laid back

I couldn’t find a photo of a table clothe that matched the dresses but you get the idea of a bright table clothe, something that pops with color and youth! Something a little more fun!
A really fun cake! And for those that don’t like cake, or to just add a little more variety in there; cupcakes!

I’d stick with the same suits but maybe lose the jackets and just go with the vests? A little more casual.

And some more color with your flowers!