Royal blue.
No... cerulean.
No... turquoise.
Perhaps on some level our free-will is made less than perfectly free, but it is only natural that our free-will be less than free. The definition of free-will, if it is something that actually exists, for everyone, as claimed by the people who propose that God is omniscient, must include this factor - it is not 100% free.
If you define free-will as 100% free-will, you automatically MUST throw out the idea that everyone has it.
So perhaps we are constrained in some way by God's knowledge, forced to choose between types of blue. So what?
- Perhaps God is accurate enough in predicting things that all God's inaccuracies are in unkown dimension # seventy-three. To us God is effectively omniscient, but there is still plenty of room for the unknown outside of our sphere of concern. YOU are the one who insists on the strictest interpretation of the word "omniscience".
- Perhaps God has ACCESS to all knowledge, in God's non-temporal existence, but chooses not to access the information about anything that happens for the split second before it happens to allow you to choose. Again, you don't consider ACCESS to all knowledge omniscience, but I would say the word could apply.
EDIT - I like this one right now - you have knowledge, yet you don't have to be thinking about it at any particular time to consider it "known".
OR-
You have it backwards, for you the effect leads the cause, just because you perceive it occuring before the cause. However, this cause and effect link you insist upon is not necessary. The activity in your brain caused by knowing the past doesn't affect the past, does it? The past affects the knowledge.
If God sees time laid out flat and doesn't perceive a future or past, God could just as easily say "that is happening right now", as say, "that happened tomorrow." God could say your grandmother is being born and you are being born right now, and our definition of "right now" is simply an illusion we are presented with so our physical minds can grasp existence.
OR-
following wes's answer, "no" - there is an argument in there somewhere about simply letting things be, implying that you didn't choose them, meaning you weren't forced to choose them, meaning you have free-will.