they look live to me, and i'd guess cymbidium orchid.
Also, what are the white flowers?
I googled "blue cymbidium orchid" & I found these, they do look like them...
And how do I add the live flowers to the cake? Do I need flower spikes? I'm worried they will get too hot/wilt or die (the wedding will be in July). Do I add them right before they pick it up? I'm doing a small 2 or 3 tiered cake.
The white ones could be stock.
Not sure what the others are, but the really vibrant ones are blue dendrobium, they look real.
I agree with shanter, the white could be stock.