A skill icons replacement just for fun.
First aid skills -- Hive
Medic/Ammo bag skills -- Support station
Turret skills -- Turret
C4 skills -- Sticky bomb
ECM skills -- Pulse

Inspire -- Recovery Link
Iron man -- Survivor Link
Bulletstorm -- Tactical Link

All the skill textures that have been replaced are highlighted in the picture.
drop the file to assets/mod_overrides.