i duplicated the sc_idea function, renamed it sc_idea2, and added add_shortcode( 'idea2', 'sc_idea2' ); near the end of the file. it's easy enough to find the icon inside the function. quicker than adding icon variables.
i appreciate the tip about updates, but i haven't done any because muffin doesn't seem to detail what's been changed.
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theme-shortcodes.php
and change the icon in it without too much trouble. woot!