Possible Duplicate:
Is it possible to get the tux logo on the text based boot?
I want to add jpg logo in Terminal..but not ascii format
Possible Duplicate:
Is it possible to get the tux logo on the text based boot?
I want to add jpg logo in Terminal..but not ascii format
Right-click -> Profile -> Profile Preferences -> Background:

UPDATE:
Apparently the question is about how to add a greeting message to the Terminal:
Usually this is done by adding a message to /etc/issue, /etc/banner or /etc/motd, depending on what conditions you want the message to be displayed.
/etc/bash.bashrc might work as well:
echo " I'M THE GREAT CORNHOLIO!!! "
echo " ________________ "
echo " / \ "
echo " / / \ \ \ "
echo " | | "
echo " / / "
echo " | ___\ \| | / / "
echo " | / | "
echo " | | __ | "
echo " / | \ | "
echo " | | \ | "
echo " | | __ | "
echo " | __\ (_o) | "
echo " | | | "
echo " \ || \ "
echo " | |__ \ "
echo " | | (*___\ "
echo " | | _ | "
echo " | | //_______| "
echo " | / |_|_|_|___/\ "
echo " \| \ - | "
echo " | _----_______/ "
echo " | / "
echo " |_____/ "