Plugin to add extra icons or images in breadcrumb navigation

Dear All,

I am trying to develop a plugin by extending navigation/breadcrumbs to add extra icons or image beside breadcrumb navigation. But still i can't able to do that, So far I have done is can add my custom breadcrumb with existing breadcrumbs or override existing breadcrumbs with my custom breadcrumbs. Is there any ways to add custom icons or images in breadcrumb navigation? Need urgent help.

Thanks in advance,