Take a look at actual online wallets, such as blockchain.info for instance. Is that possible to create the same type of online website but that allows cold storage wallets creation ?
didn't really understand what do you mean but from what i understood yes you can create a cold storage wallets and put it in an online service just like coinbase, xapo and blockchain.info if i am not wrong...etc
It would cease to be cold the moment you stored it on an online service...