If you have one or more custom player skulls in your inventory, the off-hand slot background will change to display a strange white, black, and gray texture, unless:
You have moused over a slot equal to or later than the last slot containing a custom head.
There is an item in a slot after the last slot containing a custom head.
There is an item in the off-hand slot.
Additionally, if a custom skull is placed in the helmet slot, all other armor slots will gain a black background. Mousing over one of the armor slots or placing a piece of armor in one of them fixes all later armor slots, but color shifts the background of the armor slot in question to different shades of gray. Also, If a custom player head is the last item in your hotbar, the attack strength indicator has a solid black background instead of being transparent.
This bug affects both creative and survival game modes.
To reproduce:
Give yourself a custom skull with the command
/give @p skull 1 3 {SkullOwner:AnyPlayerName}
Also the head from the creative inventory works
Mess around with it in your inventory.
Linked issues
is duplicated by
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Updated the description and title.

Confirmed for these 15w51a and b, bug doesn't exist in older versions, such as 15w50a and lower
Confirmed for 16w03a

Do you use OptiFine or similar?
I have the same issue with OptiFine.

using optifine or not doesn't matter in this case, it's a vanilla bug

This doesn't happen in 1.9.2 anymore, so it has probably been resolved.

The issue is still there for me, take a look at the screenshots, and reenact them, You'll see tge issue.
Still in 1.9.4

Confirmed, I thought at first it's a problem with my custom GUI texturepack, somewhat glad it isn't as I couldn't find a fix.
The potion effect background gets a white overlay in my case, I can also confirm inventory overlays/problems.
It only applies to ANY custom heads for me, not only playerheads. Ingame skulls are not affected, it seems.
2 comparison Screenshots (custom head + ingame skull) attached.
Give-Command for a custom-made non-player head:
give @p minecraft:skull 1 3 {SkullOwner:{Id:4ee3b250-2313-3d1c-1eab-1a989ee2d051,Properties:{textures:[{Value:eyJ0aW1lc3RhbXAiOjE0NjM0NDU1MjQxMjksInByb2ZpbGVJZCI6IjUwNzk4YjJhN2QxYjQxYTRiNmFlYzRiNWUwOWJjMTcxIiwicHJvZmlsZU5hbWUiOiJFbHN3ZXlyIiwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlLzNiOWY2YzdmYzMxZDJmOTg0NDM4MTJiMmQ5MWFhM2VjYzlhMTQ2OGIzZWRhYTE4YTkyN2FlMGI3YzJjNGM2In19fQ== }]}}}
Still in 16w20a
Still in 16w21a

confirmed for 16w21b
Still in 1.10-pre1
Affects armor slots as well. Attaching screenshot.
edit: Since you are still updating the description please include something about armor slots.