You stumble upon a statue. It depicts an elf with a look of horror frozen on her face. An inscription at the bottom reads: "Not all petrification goes bone-deep."
Didn't find this one through search or on the wiki, so adding it here just in case. Stumbled upon this on D12, CoC.
You stumble upon a statue. It resembles an ancient white rabbit, hewn from gold smelling faintly of frankincense. An inscription at the bottom reads: "Cas Go Par!"
I found in UC2 this beautiful statue in memory of a pet:
You stumble upon a statue. Small and shaped like an elegant cat, stretching, it is made of crumbly white alabaster with pink ruby eyes that seem to sparkle as if lit by a ray of sunlight. An inscription at the bottom reads: "Willow, a gentle creature, she loved the light and we loved her"
If you stumble on a statue in a dark room, you get the message "You stumble against some kind of stone block."
Happened in D12 with this statue (the text in the message buffer was arranged in this way):
You stumble upon a statue. A peculiarly formless statue.
or
A nondescript statue. An inscription at the bottom reads: "THE UNKNOWN GOD"
Found in UC1:
You stumble upon a statue. Carved from a block of silver leaf jasper, it depicts a lightly built, short-haired cat with friendly slanting eyes and dark points. An inscription at the bottom reads: "Requiesce cat in pace Darion"
In UD6:
You stumble upon a statue. It appears to be of a robed figure, holding a tome. An inscription at the bottom reads: "Argyll, the compiler of odd tales"
In UD8:
You stumble upon a statue. A band of cocky trolls, petrified by their encounter with reality, still appearing to smugly surveying their surroundings with upturned noses and blind eyes. An inscription at the bottom reads: "In memorandum of things best forgotten"
In D37:
You stumble upon a statue. The mottled black and red eudialyte stone has been polished and scuplted into the shape of a giant, humanoid heart. An inscription at the bottom reads: "I want to hear your screams!"
Found in D47:
You stumble upon a statue. An ashy blackness pulses over the statue's surface, giving it an appearance of gaseous immateriality. An inscription at the bottom reads: "There's no smoke without fire!"
You stumble upon a statue, it represents a young woman holding a fairy dragon in her hands exquisitely crafted from mithril and inscription at the bottom reads “in memory of thecla”
In UD7:
You stumble upon a statue. The dark statue of a tall, athletic man lies ahead of you. A mischievous smile is frozen on his face, and bright green eyes seem to be fixing you with their gaze. An inscription at the bottom reads: "I do what I try what I am"
In D17:
You stumble upon a statue. Apart from the two rubies it has for eyes, it is made of pure black onyx, absorbing any light that touches it. Its eyes remind you of someone from ancient times, someone whose face you remember seeing in old tomes... a scholar or wizard, perhaps? An inscription at the bottom reads: "Teach and be taught!"
A statue without inscription in D25:
You stumble upon a statue. It is of a thinly built man huddled as if to squeeze through a narrow gap. He leads with a stone crossbow, held at arm's length.
In D40:
You stumble upon a statue. It appears to be a fierce dwarf ranger cunningly depicted out of a massive block of granite. An inscription at the bottom reads: "ye'll need more than that to hurt me!"
In UL5:
You stumble upon a statue. It seems to be a wooden carving of a kobold holding a baby human An inscription at the bottom reads: "To Mkita, for not eating my baby"
My sincerest apologies if this is considered necroposting, but I found a statue not listed in this thread (as far as a quick skim goes):
Your eyes tingle. You stumble upon a statue. It seems to flicker in and out of existence. The few glimpses you manage to catch of it seem to radiate in all the colors of the rainbow. An inscription at the bottom reads: 'Seeing is believing'.
I had the 'See Invisible' intrinsic, don't know if that affected anything. I couldn't interact with it with either 'h' or 'k'. My primate brain lost interest quickly and went swiftly off to die.