This Dapp uses this simple escrow contract to make a button itself the escro service.
Simple change the contract address of the {{> buyButton}} in the index.html to a newly deployed contract.
Then visit this page in Mist or use your local ethereum node with RPC enabled (geth --rpc --rpccorsdomain "http://ethereum-escrow-dapp.meteor.com").
If you visit and you have the seller account in web3.eth.accounts (The creator of the contract) you will interact with the button as the seller.
If you are a buyer you can buy the product and interact with the button as the buyer.