I didn't find any plugin to change project description randomly or you can say that parametrization of project description.

Here we can use build status as parameter or any other user defined parameter which we can put into the project description which keeps on changing as per the values contained.

e.g.
Say I have following line in my Project description:
<B>Source Code Repository:</B><BR>
[SVN URL used for building the latest build which is random]

Suppose I am using Ant scripts as builder where I can use random SVN URL inside my Ant script which I want to put inside project description.