I just remembered something from my Anabaptist heritage tour of Europe in summer of '04. We saw several Mennonite churches in Germany and the Netherlands, and one in particular, known as the Menno Simons church (they think he served there as elder/pastor) had not exactly a cross, but a chai-roh!
The Chai-Roh (the Greek letters for CR, the first 2 letters in "Christ") was the symbol that the Roman emperor Constantine saw at the battle of Mylvian Bridge in a vision along with the words "by this sign, conquer." It was superimposed on the sun, which he worshipped, but he took it as a sign from Jesus, took this symbol (it sort of looks like an X with handles) to symbolize his army, and he defeated his enemy.
After that, Constantine issued the edict of toleration, which tolerated all religions across the empire, but funded the church. Part of the funding was reparations owed for stolen property, and part of it was his backing--an transforming--a powerful social institution.
It was this adaptation of the church from persecuted minority to powerful state force that the Anabaptists rejected. Some even said that was where the church fell--became "fallen." So for this little Menonite church in the Netherlands to display this symbol is quite a contrast!