Attempted to get particles working. Used the dart blower as the test

src/minecraft/biomesoplenty/ClientProxy.java

@@ -12,6 +12,7 @@ import biomesoplenty.items.projectiles.EntityDart;
 import biomesoplenty.items.projectiles.EntityMudball;
 import biomesoplenty.items.projectiles.EntityPoisonDart;
 import biomesoplenty.items.projectiles.RenderDart;
+import biomesoplenty.particles.EntityDandelionFX;
 import cpw.mods.fml.client.registry.RenderingRegistry;
 
 public class ClientProxy extends CommonProxy {
@@ -47,6 +48,13 @@ public class ClientProxy extends CommonProxy {
 		mc.effectRenderer.addEffect(entityfx);
 	}   
 	
+	@Override
+	public void spawnDandelion(World world, double x, double y, double z, double xVel, double yVel, double zVel) 
+	{   
+        EntityDandelionFX entityfx = new EntityDandelionFX(mc.theWorld, x, y, z, 1.0F);
+		mc.effectRenderer.addEffect(entityfx);
+	}   
+
 	@Override
 	public int addArmor(String armor)
 	{

src/minecraft/biomesoplenty/CommonProxy.java

@@ -27,4 +27,9 @@ public class CommonProxy {
     {
 
     }   
+    
+    public void spawnDandelion(World world, double x, double y, double z, double xVel, double yVel, double zVel) 
+    {
+
+    }   
 }

src/minecraft/biomesoplenty/items/projectiles/EntityDart.java

@@ -231,7 +231,7 @@ public class EntityDart extends EntityArrow
                     
         			for (int p = 0; i < 16; ++i)
         			{
-        				BiomesOPlenty.proxy.spawnDart(this.worldObj, this.posX, this.posY, this.posZ, 0.0D, 0.0D, 0.0D);
+        				BiomesOPlenty.proxy.spawnDandelion(this.worldObj, this.posX, this.posY, this.posZ, 0.0D, 0.0D, 0.0D);
         			}
                     
                     this.playSound("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));

src/minecraft/biomesoplenty/particles/EntityDandelionFX.java

@@ -0,0 +1,106 @@
+package biomesoplenty.particles;
+
+import cpw.mods.fml.client.FMLClientHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.particle.EntityFX;
+import net.minecraft.client.renderer.RenderEngine;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.util.Icon;
+import net.minecraft.world.World;
+
+public class EntityDandelionFX extends EntityFX {
+
+	float reddustParticleScale;
+
+	public EntityDandelionFX(World par1World, double par2, double par4, double par6, float par8)
+	{
+		super(par1World, par2, par4, par6, 0.0D, 0.0D, 0.0D);
+		this.motionX *= 0.10000000149011612D;
+		this.motionY *= 0.10000000149011612D;
+		this.motionZ *= 0.10000000149011612D;
+
+		float f4 = (float)Math.random() * 0.4F + 0.6F;
+		this.particleScale *= 0.75F;
+		this.particleScale *= par8;
+		this.reddustParticleScale = this.particleScale;
+		this.particleMaxAge = (int)(8.0D / (Math.random() * 0.8D + 0.2D));
+		this.particleMaxAge = (int)((float)this.particleMaxAge * par8);
+		this.noClip = false;
+		
+		this.particleTextureIndexX = 0;
+		this.particleTextureIndexY = 0;
+	}
+	
+	@Override
+	public int getFXLayer()
+	{
+		return 1;
+	}
+	
+	@Override
+	public void setParticleTextureIndex(int par1)
+	{
+	}
+
+	@Override
+	public void setParticleIcon(RenderEngine par1RenderEngine, Icon par2Icon)
+	{		
+		final String[] textures = new String[] {"/mods/BiomesOPlenty/textures/particles/dandelion.png"};
+		
+        Icon[] icon = new Icon[textures.length];
+        par2Icon = icon[0];
+		//Icon = par1RenderEngine.bindTexture("/mods/BiomesOPlenty/textures/particles/dandelion.png");
+	}
+
+	public void renderParticle(Tessellator par1Tessellator, float par2, float par3, float par4, float par5, float par6, float par7)
+	{	
+		float f6 = ((float)this.particleAge + par2) / (float)this.particleMaxAge * 32.0F;
+
+		if (f6 < 0.0F)
+		{
+			f6 = 0.0F;
+		}
+
+		if (f6 > 1.0F)
+		{
+			f6 = 1.0F;
+		}
+
+		this.particleScale = this.reddustParticleScale * f6;
+		super.renderParticle(par1Tessellator, par2, par3, par4, par5, par6, par7);
+	}
+
+	/**
+	 * Called to update the entity's position/logic.
+	 */
+	 public void onUpdate()
+	{
+		this.prevPosX = this.posX;
+		this.prevPosY = this.posY;
+		this.prevPosZ = this.posZ;
+
+		if (this.particleAge++ >= this.particleMaxAge)
+		{
+			this.setDead();
+		}
+
+		this.setParticleTextureIndex(7 - this.particleAge * 8 / this.particleMaxAge);
+		this.moveEntity(this.motionX, this.motionY, this.motionZ);
+
+		if (this.posY == this.prevPosY)
+		{
+			this.motionX *= 1.1D;
+			this.motionZ *= 1.1D;
+		}
+
+		this.motionX *= 0.9599999785423279D;
+		this.motionY *= 0.9599999785423279D;
+		this.motionZ *= 0.9599999785423279D;
+
+		if (this.onGround)
+		{
+			this.motionX *= 0.699999988079071D;
+			this.motionZ *= 0.699999988079071D;
+		}
+	}
+}