I'm in South Korea's Incheon Airport right now, and I came upon quite realistic synthetic trees:
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Unless you're all the way up next to them, they're basically indistinguishable from real pine trees. (I think they should have a few more branches and pine needles on them, but that would be easy to accomplish.)
This reminded my of our discussion earlier in this thread about using synthetic trees to obscure the Cosmic Rewind "Big Blue Box" and other visible show buildings.
Just like with Imagineering's other uses of "things in the foreground of show buildings or plain walls," they don't have to obscure the view entirely, but simply draw attention from the background to the foreground. An extreme/imperfect example of "distraction over complete-view-blocking," at least according to Foxx Nolte from Passport2Dreams (if I remember correctly), is the line of flags that reduces the noticeability of some fairly plain walls in Fantasyland:
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Anyway, I think having a few thoughtfully-placed "trees" of different sizes, etc., could make the Cosmic Rewind "Big Blue Box" a little "easier on the eyes," as they could do for other visible show buildings.