http://bukkit.fr/index.php?threads/9621/

MoreRecipes.java

package fr.neatmonster.morerecipes;

import org.bukkit.Material;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.PrepareItemCraftEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;

public class MoreRecipes extends JavaPlugin implements Listener {
    private static final ItemStack indianFeather = new ItemStack(Material.FEATHER);
    private static final ItemStack indianHelmet  = new ItemStack(Material.LEATHER_HELMET);
    static {
        final ItemMeta indianFeatherMeta = indianFeather.getItemMeta();
        indianFeatherMeta.setDisplayName("Plume indienne");
        indianFeather.setItemMeta(indianFeatherMeta);
        final ItemMeta indianHelmetMeta = indianHelmet.getItemMeta();
        indianHelmetMeta.setDisplayName("Coiffe indienne");
        indianHelmet.setItemMeta(indianHelmetMeta);
    }

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
        final ShapedRecipe indianHelmetRecipe = new ShapedRecipe(indianHelmet);
        indianHelmetRecipe.shape("AAA", "BBB", "B B");
        indianHelmetRecipe.setIngredient('A', Material.FEATHER);
        indianHelmetRecipe.setIngredient('B', Material.LEATHER);
        getServer().addRecipe(indianHelmetRecipe);
    }

    @EventHandler
    public void onPrepareItemCraft(final PrepareItemCraftEvent event) {
        if (event.getRecipe().getResult().isSimilar(indianHelmet)) {
            for (int i = 0; i < 3; i++)
                if (!event.getInventory().getMatrix()[i].isSimilar(indianFeather))
                    event.getInventory().setResult(null);
        }
    }
}

plugin.yml

name: MoreRecipes
version: 0.0.1
author: NeatMonster
main: fr.neatmonster.morerecipes.MoreRecipes