You have to edit SMW's graphics with a program like yy-chr, so first download that (it's in the tools section of SMWcentral), then you have to extract the graphics using Lunar Magic (there's a button in the menu bar which says "extract GFX")
Then search for the graphics file which has the graphics for "Mario Start!", open it with yy-chr, and change them to "Go Zizuma!" or whatever you want.

Work in progress:
Mario's Search For The Golden Feather:
My entry for C3
Then search for the graphics file which has the graphics for "Mario Start!", open it with yy-chr, and change them to "Go Zizuma!" or whatever you want.

Work in progress:
Mario's Search For The Golden Feather:

My entry for C3