Although Tenebrix was the first Scrypt coin Litecoin was much more than a clone.  Litecoin borrowed the best features from lots of coins to try and create something unique.  I think they did that very well.

Dogecoin is actually a clone of Foocoin.  The creators used a howto guide on the web to create a clone. They are fairly honest about all this.  The life of the coin is supposed to mirror the life of the Gangnam meme which was about 12 months.  They just never expected it to become so popular.

http://www.csimpson.com.au/freelance/dogecoin/