This will allow you full blur to your Start Menu:
Here's what it will look like:
Sunbeam 2000 gave me permission to Stylehack this. This has NO Search Box.
When you apply the hack APPLY THE IMAGES because there are a lot of necessary image changes in it.
TEST it out on a test.msstyles ( aero renamed) first. BACKUP your theme msstyles so you can always go back. Compare test msstyles with a copy of aero with the DIFFERENCE TOOL to see what's changed.
Not everything is changed. I didn't include a transparent Scroll Bar because it would make all your Scroll Bars transparent.
Some arrows and buttons need to be tweaked etc. But you can do that after application. All the big stuff is done.
If you do make changes DON'T TOUCH the ContentMargins or DefaultPaneSize:Rect of StartMenu > Basic > Open Box or OpenBox Extended. Also don't touch any of the Bool properties and values.
Hope you like it