you can edit your mig and give it a new look the way you want. but notice editing mig,decompile,reverse engineer or re implementing is quite illegal. so edit your mig for your sole purpose. Do not distribute,sale or post it on the net so the other people mite use it and you will be sentenced.
1. download a mig33.jar file to your computer from wap.mig33.com
2. go to the command line(MSDOS in windows) and rename the *.jar into *.zip file
3. Open the zip file with any unzipping utility like winzip,winrar,qzip
4. Extract the zip file to a new folder
5. Now you can edit the mig smileys by editing the file j.png, or mig main
logo by k.png or application icon by MiG33.png
5. if you want to alter the mig name, go to the folder META-INFO and edit the file MANIFEST.MF with a notepad( edit carefully or ur mig will not work)
6. Now select the all files and folders in the extracted folder
7. Right-click, select send to, compressed(zipped)Folder
8. now go to the command line again and rename the new zip file to file.jar
9. Enjoy!