The Biblical Christianity Blog has a nice exposition of 1 Corinthians 1:22-25.  The post includes this very nice illustration:

Let every pulpit rightly say, “we preach Christ crucified!” A strong church once inscribed these words on an archway leading to the churchyard. Over time, two things happened: the church lost its passion for Jesus and His gospel, and ivy began to grow on the archway.  The growth of the ivy, covering the message, showed the spiritual decline. Originally it said strongly, we preach Christ crucified.  But as the ivy grew, one could only read we preach Christ, and the church also started preaching “Jesus the Great Man” and “Jesus the Moral Example” instead of Christ crucified.  The ivy kept growing, and one could soon only read, we preach.  The church also had even lost Jesus in the message, preaching religious platitudes and social graces. Finally, one could only read we, and the church also just became another social gathering place, all about we and not about God.