I used this:
/give @p skull 1 3 {SkullOwner:{Id:"30c793d3-5755-455d-94bb-6b71c18be47c",Properties:{textures:[{Value:"eyJ0aW1lc3RhbXAiOjE1MDU4NTgzNjE2ODQsInByb2ZpbGVJZCI6IjMwYzc5M2QzNTc1NTQ1NWQ5NGJiNmI3MWMxOGJlNDdjIiwicHJvZmlsZU5hbWUiOiJfRGVzc2llIiwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlLzhmNzlhMDM5OTk2OWNiOTFmMzVmMWNhNmQ1ZTMyZDkzMmRmM2VmZWUyNmNjMTg2YWE5OWI3ZjdiMzdiMjU1OSJ9fX0="}]}}}
I had two of these going (With different texture values) and they gave the same thing. They both give alex skins now.
Dessie
I used this:
/give @p skull 1 3 {SkullOwner:{Id:"30c793d3-5755-455d-94bb-6b71c18be47c",Properties:{textures:[{Value:"eyJ0aW1lc3RhbXAiOjE1MDU4NTgzNjE2ODQsInByb2ZpbGVJZCI6IjMwYzc5M2QzNTc1NTQ1NWQ5NGJiNmI3MWMxOGJlNDdjIiwicHJvZmlsZU5hbWUiOiJfRGVzc2llIiwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlLzhmNzlhMDM5OTk2OWNiOTFmMzVmMWNhNmQ1ZTMyZDkzMmRmM2VmZWUyNmNjMTg2YWE5OWI3ZjdiMzdiMjU1OSJ9fX0="}]}}}
I had two of these going (With different texture values) and they gave the same thing. They both give alex skins now.