Quote:
I'm thinking that the toolbars, and their associated lettering, are likely stored as Graphics...


I agree, in which case you would require larger icons and understand how to substitute them in BIAB. Difficult but not impossible. They likely can be located in the BB folder with the file extension .ico. Substitute your new icons USING THE SAME FILE NAME AND EXTENSION AS THE ORIGINAL. Obviously, save the originals in case you should have to roll back.