There are many meatless congees. The most simple is 白粥 (bái zhōu), which is simply rice and water but you can add anything. It is usually served here with pickled vegetables similar to kimchi. A common version is with eggs, usually century eggs with greens, but salted or just chopped-up boiled eggs are also used.
It's bed time here in the land of the rice eaters but I'll add more tomorrow.