ZOMGwings - a SpellActivationOverlay-based alerter for the Fangs of the Father weapon set proc.
When your legendary daggers proc, the AddOn will flash awesome wings on your screen just in case you miss the awesome wings coming out of your back. It's lightweight, it has no config* and nothing else really either. Unzip and it works! Note. Unlike the pic, the AddOn does not blur out the screen, it just does the wings.
*if you want to move, scale, or recolor the wings, you need to modify magic.lua. if you want to track something else than the legendary dagger proc, you can open magic.lua and replace the value on the local "idtotrack" with your desired spellID.