Speaking of decentralized exchanges, I have begun customizing the Bitshares web wallet for Gridcoin; the customization set OPEN.GRC as the main trading pair with a large quantity of popular assets as well as FIAT smartcoins (USD, CNY, GBP, etc).

https://steemit.com/gridcoin/@cm-steem/gridcoin-s-customised-bitshares-web-wallet-dex

I need to uplift the repo to the latest bitshares gui release then will try adding new drop-down menus to the navigation bar (links to GRC, BOINC, BTS websites).