I’m convinced that I once saw IPFS url links in smart contract output from the Concordium-client, but I’ve never been able to replicate this 
Does this ring a bell for anyone? For example, the spaceseven contract should have ipfs urls stored?
I am not aware of any specific contract that does this, but contracts could store IPFS links, and maybe some space seven NFT contracts do. concordium-client contract show would then display those.
However there is no built-in integration of Concordium and IPFS so if there are such links they are chosen by the writer of the smart contract.