Aye Mates,

I knew that in 14w18b there was a bug which allowed to rewrite the blockdata of a playerhead to get a texture from a specific URL like YouTuber Dragnoz showed in one of his videos.
http://www.dragnoz.com/custom-head-block-generator/
Now its back.

/give @p skull 1 3 {display:{Name:"Player Head"},SkullOwner:{Id:49EF8D47-364C-88B0-3AC4-6ECF72575026,Properties:{textures:[{Value:e3RleHR1cmVzOntTS0lOOnt1cmw6Imh0dHA6Ly9hdmF0YXIuYWRydW5kYWFsLmRlL3NraW4vQmFzdGlrZWtzIn19fQ===}]}}} 

UUID is custom created by dragnoz online tool.
The "textures:" part is an url which leads to avatar.adrundaal.de/skin/Bastikeks
(my Skin)