What's a good use for ribbons????
I always would put a ribbon around my xmas presents after wrapping them, makes them so pretty!
https://www.allegro.cc/forums/thread/610638
Al_draw_ribbon is generally useful for drawing curved lines easily. Unlike al_draw_spline you don't need any control points.
Allegro 5 ribbons could be nice for ribbon text logos. You'd have to use al_draw_ribbon for the background an then al_calculate_ribbon and al_draw_glyph to draw the text correctly.