I'd like to create an UTXO style coin contract to trace each coin movement. There are many account based coin contracts, but I couldn't find any UTXO coin contract. Are they any samples?
The token contracts are based on functionality that is baked-in to ethereum, including the ability to send from one address to another, which provides your traceability.
Building another mechanism in a smart contract just to provide UTXO functionality is therefore a bit of an unnecessary exercise, and possibly very expensive. If traceability is what you need it is already available.