We wanted to do Black Friday specials…
Is there a way to add anything such as an icon or emoji (little gift bow or something) to an item that is on special?
BESIDES the “sale” sign.
Try this app: DECO Product Labels & Badges
The app can help you add nice-looking product label or stickers into the items. The app also provides Free plan, so test it out!
Also, if you’re looking to create Black Friday special promotions, try BOGOS: Free gifts, Discounts & Bundles app. The app can help you create powerful sales campaign to boost sale 
Hope it helps,
Ellie