Very nice, picking icons for my plugins is the hardest part of writing them. If someone out there with decent icons skills wants to volunteer their time to act as icon provider to give all the plugins a consistent look I would be delighted.
Speaking of which, perhaps this might be a time to remind people of a little tip. I'm not sure how dwanthny replaced his icon, but you don't need to go fiddling with the plugin zip file (because if you do, every time you get a new release your icon will be lost).
Instead what you do is navigate to your calibre configuration directory (Preferences -> Miscellaneous). It varies by OS e.g. on XP this will put you in:
C:\Documents and Settings\<username>\Application Data\calibre
Then if you don't have one already (you will have if you use the Generate Cover plugin), create a "resources" subfolder, and inside that create a "images" folder.
C:\Documents and Settings\<username>\Application Data\calibre\resources\images
(Incidentally if you were to put an image of the same name as any of calibre's icons, calibre will use that from here, allowing you to give calibre a different look that survives reinstalling new calibre versions).
Now if you create a subfolder within that images folder for a specific plugin name, you can override any icons for that plugin. In Walt's case above, if we create a "Favourites Menu" subfolder, and put in there an image called "favourites_menu.png" then calibre will use that instead of the one bundled with the plugin. And you can upgrade the plugin while keeping your preferred icons without any future faffing.