ClientEventHandler.java

package matyk.aqarium2.eventHandler;

import matyk.aqarium2.main.Main;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.item.Item;
import net.minecraftforge.client.event.ModelRegistryEvent;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class ClientEventHandler {
	
	@SubscribeEvent
	public void registerModels(ModelRegistryEvent event) {
		String name = "randore";
	    ModelLoader.setCustomModelResourceLocation(Item.getItemFromBlock(EventHandler.testBlock), 0, new ModelResourceLocation(Main.MODID + ":" + name, "inventory"));
	}
}

EventHandler.java

@SubscribeEvent
	public void registerBlocks(RegistryEvent.Register<Block> event) {
		testBlock = new RandomOreBlock(Material.ROCK, 0, 0, CreativeTabs.MATERIALS);
	    event.getRegistry().registerAll(testBlock.setRegistryName("randore").setUnlocalizedName(Main.MODID + ":" +"randore"));
	}
	
	@SubscribeEvent
	public void registerItems(RegistryEvent.Register<Item> event) {
		String name = "randore";
	    event.getRegistry().registerAll(new ItemBlock(testBlock).setRegistryName("randore"));
	}

RandomOreTile.java

package matyk.aqarium2.tiles;

import java.util.Random;

import matyk.aqarium2.main.Main;
import net.minecraft.block.state.IBlockState;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.play.server.SPacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.fml.common.network.NetworkRegistry;
import net.minecraftforge.fml.common.network.simpleimpl.IMessage;

public class TileRandomOre extends TileEntity {
	public byte red = 100, green = 100, blue = 100;
	public TileRandomOre() {
	}
	
	@Override
	public boolean shouldRefresh(World world, BlockPos pos, IBlockState oldState, IBlockState newState) {
		world.notifyBlockUpdate(pos, oldState, newState, 3);
		return true;
	}
	
	@Override
	public void onLoad() {
		super.onLoad();
		world.markBlockRangeForRenderUpdate(pos, pos);
		world.getBlockState(pos);
		world.notifyBlockUpdate(pos, world.getBlockState(pos), world.getBlockState(pos), 3);
	}
	
	@Override
	public void onChunkUnload() {
		super.onChunkUnload();
	}
	
	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound cmpd) {
		super.writeToNBT(cmpd);
		cmpd.setByte("red", red);
		cmpd.setByte("green", green);
		cmpd.setByte("blue", blue);
		return cmpd;
	}
	
	@Override
	public void readFromNBT(NBTTagCompound cmpd) {
		super.readFromNBT(cmpd);
		this.red = cmpd.getByte("red");
		this.green = cmpd.getByte("green");
		this.blue = cmpd.getByte("blue");
	}
	
	@Override
	public NBTTagCompound getUpdateTag() {
		super.getUpdateTag();
		NBTTagCompound cmpd = new NBTTagCompound();
		cmpd.setByte("red", red);
		cmpd.setByte("green", green);
		cmpd.setByte("blue", blue);
		return cmpd;
	}
	
	@Override
	public void handleUpdateTag(NBTTagCompound cmpd) {
		super.handleUpdateTag(cmpd);
		this.red = cmpd.getByte("red");
		this.green = cmpd.getByte("green");
		this.blue = cmpd.getByte("blue");
	}
	
	@Override
	public SPacketUpdateTileEntity getUpdatePacket() {
		super.getUpdatePacket();
	    NBTTagCompound cmpd = new NBTTagCompound();
	    cmpd.setByte("red", red);
		cmpd.setByte("green", green);
		cmpd.setByte("blue", blue);
	    return new SPacketUpdateTileEntity(getPos(), 1, cmpd);
	}

	@Override
	public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt) {
		super.onDataPacket(net, pkt);
	    NBTTagCompound cmpd = pkt.getNbtCompound();
	    this.red = cmpd.getByte("red");
		this.green = cmpd.getByte("green");
		this.blue = cmpd.getByte("blue");
	}
}