This is a user generated database, it uses all the heads uploaded by the home page generator. You can search through the database by typing in the headname you want to search (i.e. the search "apple" will result in a few apples). You can also use a Username to search for heads uploaded by a specific user. When you leftclick on a specific head, it will automatically copy the /give command to your clipboard. You can then paste this command in a commandblock ingame, power it with a button and it will spawn the chosen head to the nearest player.

Not working? Try the Light User Collection

Minimum length is 3
Minecraft heads