AppDrawerIcon Tutorial

Long press an empty space on your home screen.
Select Custom shortcut.

Select Pick your activity.

Select Launcher Actions.

Select Open/close App Drawer.

Select the icon.

Select ADWTheme Icon Packs.

Select the icon pack.

Select the icon.

Select OK.

Your new shortcut with custom icon.
Drag it to the App Drawer Button on the launcher bar.

The new shortcut with custom icon on your launcher bar.

I know this is a tedious pain in the .... to have to do this every time you change your theme.
The developer of the ADW Launcher decided to remove the option to theme the app drawer icon.
If you would like this option back, you can always email him and request it. Email AnderWeb