Showcase: Menu items and effects needed to be changed.

I want to do the following changes to nearly redesign the menu-bar, I am already working on it, any help would be great. I guess i can solve the first two tasks, but need a bit attention for last two.

Are the last two issues are bugs or were meant to be like this?

1. Changing the menu background, hover effect and box color (Its related to grey atm)

2. Adding background gradient to menu. and submenu, making them look like 3d buttons.

3. While hovering on the menu, there is empty space between main menu and its sub-page list, I want to decrease that.

4. When I made a child page of a sub-page, it increased the height of the sub-page list menu, I want to restore it to regular size of other menu list.