@prasadkumkar, have you seen our Forum post for Track 4 here? Hope this would inspire you in a certain direction. There are plenty of examples there.
As for cross chain architectures, there are just so many
- Cross-Chain Interoperability : Enabling The Future of DeFi | Hacker Noon
- Blockchain Interoperability & Cross-Chain Communication Series | by Matthew Hammond | Medium
- (technical read, esp. on XCLAIM here) Bridges · Polkadot Wiki
Good luck!