Not wanting to knock the FieldFrame extension as it is a fabulous extension but you could also do this with the standard built-in drop down field type. Just have a drop down for each instance and in them have the words No and Yes (I always place them backwards like that incase I don’t want the icon to appear in most cases and then it doesn’t matter if you forget to select something. Reverse if the opposite though 😉).
Now you can do this sort of thing :
{if license == "Yes"}
license icon here
{/if}
{if over18 == "Yes"}
over 18 icon here
{/if}
Same sort of thing but with the built-in field types. Again not wanting to knock FieldFrame but if you don’t use it (FieldFrame) for anything else on the site then it might be overkill to install it just for this type of thing.
Best wishes,
Mark