Beautiful dresses Sarah.
I did exactly what you want...I had the skirt from one dress(I didnt like the way the flowers were on one), matched with the bodice (I wanted lace up not 5 billion buttons).

My dress was ivory coloured, with midnight blue embroidery, my bridesmaid and maid of honor were in midnight blue with midnight blue embroidery, and my flower girl was in ivory, with ivory flowers, I've included a pic of us all together too...they are in my gallery...the link is just up a afew messages.
Oh and my flower girl was only 18 months old, so instead of flowers, she carried a teddy that was wearing an ivory dress also.