Animated Tiles with 2dToolkit for Unity

AnimatedTilesScript.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

//Drop this on the parent of a 2dToolkit TileMap to animate some of the child sprites.
//The name of each sprite must be hardcoded into the Start() fxn.
public class AnimateTileMapScript : MonoBehaviour {


	public tk2dSpriteCollectionData spriteCollection;
	
	tk2dTileMap tileMap;
	List<AnimatedTileData> tileDataList;

	void Start () {
		tileMap = GetComponentInChildren<tk2dTileMap>();
		spriteCollection = tileMap.SpriteCollectionInst;

		//Get the SpriteId's for each type of animated tile. Store the spriteId's in an
		//array, so they can be used to animate the tiles each frame
		List<int> shockBlocks = new List<int>();
		shockBlocks.Add(spriteCollection.GetSpriteIdByName("ElectricBlock0"));
		shockBlocks.Add(spriteCollection.GetSpriteIdByName("ElectricBlock1"));
		shockBlocks.Add(spriteCollection.GetSpriteIdByName("ElectricBlock2"));

		List<int> lavaBlocks = new List<int>();
		lavaBlocks.Add(spriteCollection.GetSpriteIdByName("LavaBlock0"));
		lavaBlocks.Add(spriteCollection.GetSpriteIdByName("LavaBlock1"));
		lavaBlocks.Add(spriteCollection.GetSpriteIdByName("LavaBlock2"));

		List<List<int>> animatedBlockLists = new List<List<int>>();//[shockBlocks, lavaBlocks];
		animatedBlockLists.Add(shockBlocks);
		animatedBlockLists.Add(lavaBlocks);

		//Cache all animated tiles in a list for quick lookup each frame
		tileDataList = new List<AnimatedTileData>();
		for(int x = 0; x < tileMap.width; x++){
			for(int y = 0; y < tileMap.height; y++){
				//Check each tile against our list of animated tiles. 
				int currentTile = tileMap.GetTile(x, y, 0);
				foreach(List<int> blockList in animatedBlockLists){
					if(blockList.IndexOf(currentTile) != -1){
						//Create an animationData for this tile, 
						//and cache it for quick lookups each frame
						tileDataList.Add(new AnimatedTileData {
							x = x, 
							y = y, 
							frames = blockList.ToArray()
						});
					}
				}
			}
		}
		StartCoroutine(_AnimateSprites());
	}

	IEnumerator _AnimateSprites() {
		while(true){
			//Animate frame at 10fps
			yield return new WaitForSeconds(.1f);

			AnimatedTileData tileData;
			for(int i = tileDataList.Count; i-->0;){
				tileData = tileDataList[i];
				//Increment animation frame of this tile
				tileData.frameIndex++;
				if(tileData.frameIndex > tileData.frames.Length - 1){ 
					//Loop animation
					tileData.frameIndex = 0; 
				}
				//Assign new tile
				tileData = tileDataList[i];
				tileMap.SetTile(tileData.x, tileData.y, 0, tileData.frames[tileData.frameIndex]);
			}

			tileMap.Build();

		}
	}
}

class AnimatedTileData {

	public int x;
	public int y;
	public int frameIndex = 0;
	public int[] frames;

}

This is exactly what I've been looking for! Unfortunately, when I gave this a go, I couldn't get it to work.
No errors; but the tiles in question simply don't seem to animate.