I've got a couple rough ideas that I probably won't get to, if that helps (from list in sig):
Land of Chu
Jin Ke successfully kills the King of Qin, not only delaying the unification of All Under Heaven, but completely changing the philosophy and manner in which it is first bound together.
Second Age of Han
The wind doesn't change at the Battle of Red Cliffs, leading Cao Cao's forces to emerge victorious; China is reunified under the puppet Han emperor (whom Cao doesn't kill), and the Han dynasty ends up lasting several more centuries. One butterfly being that Buddhism does less well in China -- and so, in the 8th Century, when invading muslim armies appear in the west...
The Land of Qilin
Zhu Gaoxu prevails in becoming Ming Emperor in 1424; one key result is that China does not pursue isolationist policies -- continuing Zheng He expeditions, encouraging Indian Ocean trade, etc -- and eventually come to establish a presence on the southern tip of Africa, before the Portuguese can. With an assertive China standing in their way, Portugal does not come to have any kind of "empire" east of Africa, and the course of the Age of Exploration and subsequent global balance of power is entirely altered.
The Red Pill Not Taken
The 1620's go much better for the Ming than OTL -- the Tiaping Emperor doesn't die in 1620 (by not taking the infamous Red Pills), and the Wanggong Factory Disaster doesn't happen in 1626, meaning the Manchus are contained earlier, and the state is in a better position to handle the crop crisis. As a result, the Ming survive into the 18th Century, heading a stronger China, and creating a very different century...
Dragons and Poppies
A delay in deregulating the opium trade leads to Britain reaching a diplomatic accommodation with Qing China (allowing licensed merchants to sell the drug in the cities but forbidding its spread into the countryside). TTL sees a later and less decisive Sino-Anglo War; the modernizing reign of Yixin (Prince Gong) for the latter half of the 19th Century; a more humiliated Russia following the Crimea War (w loss of influence in Manchuria and Korea); and more.
A Shift in Loyalty
Yuan Shikai backs the Emperor and the reformers during the turbulent events of 1898. Though this, combined with her death, dooms Cixi's reactionary faction, it far from guarantees the survival of the Qing Regime -- only that the revolution will come earlier, and be very different from OTL.