Mundosk Tablist

[Oliv583c]

Hi. I just recently started to learn how to make a special kind of tablist:

Using Mundosk.

But. I wanted to color some of the "player heads" like this:

I have tried a variety of ways. My method was to change my skin into a solid color. Then save my own skin in a file or variable. Then later on I could use the variable/file to set the skin on. But it just can't see it as a skin.
Here is my code (Note: This is in danish):

command /savecolor [<text>] [<text>]:
    permission: M-Ejer
    permission message: &4Du har ikke adgang til denne kommando.
    trigger:
        if arg-1 is not set:
            send "&c&lFARVE &c/SaveColor &7Add <Farve>"
            send "&c&lFARVE &c/SaveColor &7Fjern <Farve>"
            send "&c&lFARVE &c/SaveColor &7List"
        Else:
            if arg-1 is "List":
                if size of {SaveColors::*} is greater than 0:
                    send "&6&lOPRETTEDE FARVER:"
                    send ""
                    set {_N} to 0
                    loop {SaveColors::*}:
                        add 1 to {_N}
                        send "&a%{_N}%. &e%loop-value%"
                    send ""
                    send "&7Der er ialt &a%{_N}%&7 oprettede farver!"
                Else:
                    send "&c&lFARVE &cDer er ingen oprettede farver."
            Else:
                if arg-2 is set:
                    if arg-1 is "Add" or "Tilføj" or "Opret":
                        if {SaveColor.%arg-2%} is not set:
                            set {SaveColor.Skin.%arg-2%} to "%player's skin%"
                            add arg-2 to {SaveColors::*}
                            send "&c&lFARVE &7Du oprettede farven &a%arg-2%&7!"
                            set {SaveColor.%arg-2%} to arg-2
                        Else:
                            send "&c&lFARVE &cDenne farve er allerede oprettet!"
                    Else:
                        if arg-1 is "Remove" or "Fjern" or "Slet":
                            if {SaveColor.%arg-2%} is set:
                                send "&c&lFARVE &7Du fjernede farven &a%{SaveColor.%arg-2%}%&7!"
                                delete {SaveColor.%arg-2%}
                                delete {SaveColor.Skin.%arg-2%}
                                remove arg-2 from {SaveColors::*}
                            Else:
                                send "&c&lFARVE &cDenne farve er ikke oprettet!"
                        Else:
                            send "&c&lFARVE &cUkendt argument!"
                Else:
                    send "&c&lFARVE &c/SaveColor &7Add <Farve>"
                    send "&c&lFARVE &c/SaveColor &7Fjern <Farve>"
                    send "&c&lFARVE &c/SaveColor &7List"

And the code when I tried to load on the skin:

command /test:
    trigger:
        set icon of tab 4, 20 for players to {SaveColor.<Color>}

I know in the first line of code I set the variable to "%player's skin%". And it would have worked fine if I was able to use player's skin instead of "%player's skin%". But it doesn't seem to be able to save my actual skin in a file or global variable. What I mean by that is that if I use the variable {_Test} it works since it doesn't save into the variables file in the skripts folder. Does anyone know how to put the skin on? (Without actually having the skin)

Please note that I use spigot 1.8.8