I want to remove header bubble from all pages except home page. Is it possible?

Yes! You can do this by a few CSS codes. Please go to "Appearance > Theme Options > Custom CSS" and add the following code there:

/* Remove header bubble in all pages but HOME */
:not(.home) > .body-wrapper > .container > .row-fluid > .span12 > .head-bubble,
:not(.home) > .body-wrapper > .container > .row-fluid > .span12 > .bubble-triangle { 
	display: none; 

This will hide the header bubble block from all pages but homepage. Please feel free to contact me if you have any other questions, problems or suggestions.