This is the simplest of plugins, giving you a random "tip of the day", lyrics, jokes etc, whatever you want.
It will also give you a non-random daily tip, one for each day of the month. You can define the tips in a text file. Despite having over a million possible uses, it is, of course, free.
Unzip and upload into your Jamroom directory. Further instructions in the ReadMe file - as easy as pie.
Also, because of its sweet simplicity, this plugin would be a good place to look if you want an example of how a Jamroom plugin might work.