Damn, man. That's a pretty good bunch of questions. I'll try to answer these as best as I can.
For putting an image there, why not just replace your Extended Network table with an image? Use
this code and play around with it remove the text and borders. To get rid of the URL table, use this code:
CODE
<style>
.userProfileURL {display:none;}
</style>
For your Application table questions, I believe you can't edit it. They're iFrames and any sort of iFrame codes have been disabled by MySpace. Therefore, even if you edit the class of that table, it most likely won't show the way you want it to. However, you can edit the title of the Application with this code:
CODE
<style>
table.userProfileApp td {background-color:000000; font:normal 8pt Arial; color:ffffff;}
</style>
For the question about content in the About Me area, why not just put your content there? Then, you can remove the text that says "About Me" and use the code to move up your Blurbs table. It'll look like you added content DIV-style.
To edit the navigation bar, use
this code. For different Contact Table images, you can always look through Yahoo and/or Google. I'm sure they would provide a good list to choose from.