diff --git a/code/game/gamemodes/nuclear/nuclear.dm b/code/game/gamemodes/nuclear/nuclear.dm
index 14a5ffcd5ea..75a65877e81 100644
--- a/code/game/gamemodes/nuclear/nuclear.dm
+++ b/code/game/gamemodes/nuclear/nuclear.dm
@@ -288,7 +288,7 @@
 		text += "<br>"
 		text += "(Syndicates used [TC_uses] TC) [purchases]"
 		if(TC_uses == 0 && station_was_nuked && !are_operatives_dead())
-			text += "<BIG><IMG CLASS=icon SRC=\ref['icons/BadAss.dmi'] ICONSTATE='badass'></BIG>"
+			text += "<BIG>[bicon(icon('icons/badass.dmi', "badass"))]</BIG>"
 		to_chat(world, text)
 	return 1
 
diff --git a/code/game/gamemodes/traitor/traitor.dm b/code/game/gamemodes/traitor/traitor.dm
index fe45b583660..59e47eaeb0a 100644
--- a/code/game/gamemodes/traitor/traitor.dm
+++ b/code/game/gamemodes/traitor/traitor.dm
@@ -123,7 +123,7 @@
 			if(uplink_true)
 				text += " (used [TC_uses] TC) [purchases]"
 				if(TC_uses==0 && traitorwin)
-					var/static/icon/badass = icon('icons/BadAss.dmi', "badass")
+					var/static/icon/badass = icon('icons/badass.dmi', "badass")
 					text += "<BIG>[bicon(badass)]</BIG>"
 
 			text += objectives
diff --git a/code/game/objects/structures/ai_core.dm b/code/game/objects/structures/ai_core.dm
index 7447d5c9c4f..4da065bac1b 100644
--- a/code/game/objects/structures/ai_core.dm
+++ b/code/game/objects/structures/ai_core.dm
@@ -2,7 +2,7 @@
 	density = 1
 	anchored = 0
 	name = "\improper AI core"
-	icon = 'icons/mob/AI.dmi'
+	icon = 'icons/mob/ai.dmi'
 	icon_state = "0"
 	obj_integrity = 500
 	max_integrity = 500
diff --git a/code/modules/holiday/easter.dm b/code/modules/holiday/easter.dm
index f47e40e44c7..2cf4ac77a90 100644
--- a/code/modules/holiday/easter.dm
+++ b/code/modules/holiday/easter.dm
@@ -37,7 +37,7 @@
 /mob/living/simple_animal/chicken/rabbit
 	name = "\improper rabbit"
 	desc = "The hippiest hop around."
-	icon = 'icons/mob/Easter.dmi'
+	icon = 'icons/mob/easter.dmi'
 	icon_state = "rabbit_white"
 	icon_living = "rabbit_white"
 	icon_dead = "rabbit_white_dead"
@@ -67,7 +67,7 @@
 //Easter Baskets
 /obj/item/weapon/storage/bag/easterbasket
 	name = "Easter Basket"
-	icon = 'icons/mob/Easter.dmi'
+	icon = 'icons/mob/easter.dmi'
 	icon_state = "basket"
 	can_hold = list(/obj/item/weapon/reagent_containers/food/snacks/egg,/obj/item/weapon/reagent_containers/food/snacks/chocolateegg,/obj/item/weapon/reagent_containers/food/snacks/boiledegg)
 
diff --git a/code/modules/mob/dead/new_player/preferences_setup.dm b/code/modules/mob/dead/new_player/preferences_setup.dm
index 5d2bb57e839..d067aee4b1a 100644
--- a/code/modules/mob/dead/new_player/preferences_setup.dm
+++ b/code/modules/mob/dead/new_player/preferences_setup.dm
@@ -25,7 +25,7 @@
 	if(job_engsec_high)
 		switch(job_engsec_high)
 			if(AI_JF)
-				preview_icon = icon('icons/mob/AI.dmi', "AI", SOUTH)
+				preview_icon = icon('icons/mob/ai.dmi', "AI", SOUTH)
 				preview_icon.Scale(64, 64)
 				return
 			if(CYBORG)
diff --git a/code/modules/mob/living/silicon/ai/ai.dm b/code/modules/mob/living/silicon/ai/ai.dm
index aa0f2063a67..2319c1f4c17 100644
--- a/code/modules/mob/living/silicon/ai/ai.dm
+++ b/code/modules/mob/living/silicon/ai/ai.dm
@@ -14,7 +14,7 @@
 
 /mob/living/silicon/ai
 	name = "AI"
-	icon = 'icons/mob/AI.dmi'
+	icon = 'icons/mob/ai.dmi'
 	icon_state = "ai"
 	anchored = 1
 	density = 1
@@ -123,7 +123,7 @@
 	eyeobj.loc = src.loc
 	rename_self("ai")
 
-	holo_icon = getHologramIcon(icon('icons/mob/AI.dmi',"default"))
+	holo_icon = getHologramIcon(icon('icons/mob/ai.dmi',"default"))
 
 	spark_system = new /datum/effect_system/spark_spread()
 	spark_system.set_up(5, 0, src)
@@ -701,10 +701,10 @@
 						holo_icon = getHologramIcon(icon(icon_list[input], input))
 		else
 			var/list/icon_list = list(
-				"default" = 'icons/mob/AI.dmi',
-				"floating face" = 'icons/mob/AI.dmi',
+				"default" = 'icons/mob/ai.dmi',
+				"floating face" = 'icons/mob/ai.dmi',
 				"xeno queen" = 'icons/mob/alien.dmi',
-				"horror" = 'icons/mob/AI.dmi'
+				"horror" = 'icons/mob/ai.dmi'
 				)
 
 			input = input("Please select a hologram:") as null|anything in icon_list
diff --git a/icons/BadAss.dmi b/icons/badass.dmi
similarity index 100%
rename from icons/BadAss.dmi
rename to icons/badass.dmi
diff --git a/icons/mob/AI.dmi b/icons/mob/ai.dmi
similarity index 100%
rename from icons/mob/AI.dmi
rename to icons/mob/ai.dmi
diff --git a/icons/mob/Easter.dmi b/icons/mob/easter.dmi
similarity index 100%
rename from icons/mob/Easter.dmi
rename to icons/mob/easter.dmi
diff --git a/icons/mob/EvilPope.dmi b/icons/mob/evilpope.dmi
similarity index 100%
rename from icons/mob/EvilPope.dmi
rename to icons/mob/evilpope.dmi
diff --git a/icons/mob/OnFire.dmi b/icons/mob/onfire.dmi
similarity index 100%
rename from icons/mob/OnFire.dmi
rename to icons/mob/onfire.dmi
diff --git a/icons/obj/Cryogenic2.dmi b/icons/obj/cryogenic2.dmi
similarity index 100%
rename from icons/obj/Cryogenic2.dmi
rename to icons/obj/cryogenic2.dmi
diff --git a/icons/obj/doors/Door2x1glassfull.dmi b/icons/obj/doors/door2x1glassfull.dmi
similarity index 100%
rename from icons/obj/doors/Door2x1glassfull.dmi
rename to icons/obj/doors/door2x1glassfull.dmi
diff --git a/icons/obj/doors/Doorf.dmi b/icons/obj/doors/doorf.dmi
similarity index 100%
rename from icons/obj/doors/Doorf.dmi
rename to icons/obj/doors/doorf.dmi
diff --git a/icons/obj/doors/Doorfire.dmi b/icons/obj/doors/doorfire.dmi
similarity index 100%
rename from icons/obj/doors/Doorfire.dmi
rename to icons/obj/doors/doorfire.dmi
diff --git a/icons/obj/doors/Doorfireglass.dmi b/icons/obj/doors/doorfireglass.dmi
similarity index 100%
rename from icons/obj/doors/Doorfireglass.dmi
rename to icons/obj/doors/doorfireglass.dmi
diff --git a/icons/obj/doors/DoorHazard.dmi b/icons/obj/doors/doorhazard.dmi
similarity index 100%
rename from icons/obj/doors/DoorHazard.dmi
rename to icons/obj/doors/doorhazard.dmi
diff --git a/icons/turf/floors/Chasms.dmi b/icons/turf/floors/chasms.dmi
similarity index 100%
rename from icons/turf/floors/Chasms.dmi
rename to icons/turf/floors/chasms.dmi