I used the Akito's recently for a bride that wanted ivory.  The picture is in the flower gallery, and called "Leslie's wedding bouquet".
 
This rose was a big hit, and I will use it from now on for an ivory rose.  Many people admired it's beauty.  Even the mother-in-law was impressed...lol.
 
I have also used Vendella; one time they were perfect, big ivory heads, and the next time they were a peachy-pink color.  
 
The type of lighting will also make a difference in perceived color.