Indeed, this is not difficult to accomplish, do as follows
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right click to create a shortcut of Recycle Bin
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in D:\ (or anywhere else you like), create a folder, for example 'D:\Recycle Bin'
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copy the shortcut into this folder
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right taskbar -> Toolbars -> New toolbar... -> select the folder 'D:\Recycle Bin'
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right taskbar -> uncheck 'Lock the toolbar'
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right click the 'Recycle Bin>>' -> uncheck the 'Show Text' and 'Show title'
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check back the 'Lock the toolbar'. That's all.
BTW, this method is also suitable for anything you want to add it into system tray.