The title pretty much says it. I originally though The Thinker by Rodin. But it would need to be larger than the usual chia figure or the growing green bits would obfuscate the shape.
Any other suggestions?
I don’t know if it would count as a statue, but I think the bronze bust of Karl Marx that sits atop his gravestone in Highgate Cemetery, London, would be ideal for chia treatment
Not on his face, of course, but on his hair and beard.
Corcovado
“David” deserves a bit more body hair. 
I think this is the weinner, right here!
Well, it wouldn’t need a fig leaf.
All of the suggestions make me think. I think the bust of Karl Marx comes closest to an actual chia figure.
Is there a Frederick Douglass bust? I think that would work better than a standing figure.
I’m drifting into that blurry zone between “statue” and “sculpture” here, I recognize… but what about something by Jeff Koons?
I think the green chia fuzz would be too much a contrast with Koons’s metallic balloon animal… or Henry Moore’s reclining figures.
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I’d say The Discus Thrower, but now that I really look at it, I’m convinced that the original athlete did indeed have a chia head. What we see is a Greek artist’s attempt to sculpt chia bush in marble.
Is there a statue of some God/Goddess of vegetation?
Regarding David. I vote placing a strategic cucumber seed.
Walt and a bushy haired rat.
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The Venus of Willendorf – not really a statue (It’s less than 5" high), but a good candidate for its shape. It’s already sporting a head of curly hair, and its facelessness always bothered me
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The Easter Island Moai – Heck, these originally had red sandstone :headdresses". Green chia would be a nice change
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Jaume Plesna’s modern sculpture Alchemist at MIT. – This very white thing needs some color. And there’s nothing on its head
Alchemist, 2010 | MIT List Visual Arts Center
Mount Rushmore for sure because of its size! Now, it’s not really a statue, but it is a sculpture and, since it was produced in a single endeavor, the four faces can be accepted as a conglomerate.
Christ the Redeemer should still be recognizable.
Statue of Liberty as well
The Discobolus of Myron?
That mirrored bean sculpture - Cloud Gate.
Not a goof, but a work that would be enhanced might be Robert Smithson’s Spiral Jetty, with saline-resistant sprouts.
The Lincoln Memorial – hair and beard.
I see what you did there…
I’m not suggesting this as a candidate for this thread, but I gotta bring it up.
Several years ago I gave friends a statuette in a box in which I also placed a couple of packets of Chia seeds. I also plastered copies of the “ChiaPet” logo all over the box.
It was a statuette of Cthulhu
Ia! Ia! Chia fhtagn!