There actually is an example from Classical Arabic. There's a quote from Ibn Al Rumi (born a hundred years after the prophet died) where he uses the example of a baker molds the dough like an egg or something round. If you click on one of my earlier posts regarding the earth on my profile you will find one of the brothers posted it. Then again i think the egg thing was considered weak. Like even brother Osama relied more on the implication of a roundness and provided a hadith from the Prophet himself.
Cause any infidel can claim (like answering-islam did on wikipedia) that an ostrich egg is prolate and not oblate like the earth.
Dr. Yasir Qadhi said: To claim that the Quran preaches that the world is flat is an outrageous claim. In fact there is unanimous consensus amongst medieval Muslim scholars to the contrary. Ibn Hazm (d. 1064 CE), wrote over a thousand years ago in his book al-Fisal, "I do not know of a single scholar worth the title of scholar who claims other than that the earth is round. Indeed the evidences in the Quran and Sunnah are numerous to this effect" [al-Fisal, v. 2 p. 78].
Ibn Taymiyya (d. 1328 CE), someone who is typically accused of literalism, wrote that there is unanimous consensus of all the scholars of Islam that the world is round, and that reality and perception also proves this, for, as he writes, it is well known that the Sun sets on different peoples at different times, and does not set on the whole world at the same time. In fact, writes Ibn Taymiyya, it is truly an ignorant person who claims that the earth is not round. [Majmu al-Fatawa, v. 6, p. 586]. And there are many others scholars, such as al-Razi, who wrote on this subject, and I do not know of any medieval scholar who held another view.
All of this shows the necessity of gaining Islamic knowledge from reputable sources, and from verifying anything you read from the people of knowledge. (from his facebook)
In addition, the Qur'an never said the Earth has four corners, nor ends or even sides. Therefore, there is no implication of it being flat like a paper.
I think the surah which goes (Yukawwiro al-layli 'ala al nahar) implies a spherical shape of the earth.
Correct me if I'm wrong. I hope this may have helped you.