I had thought of that too Aardvark01. I would likely say mix or combination. Blend also makes me think "blend of spices." Maybe I am making too much of a distinction since they all pretty much mean the same thing.
They're synonyms (ack, did I spell that right??), which means they all basically have the same meaning. But obviously, you might not want to use blend, because a lot of people seem to see "blend" as something relating to food.