Will there ever be custom tokens in the Nano network?

I know that Nano was never designed to be anything more than just a currency. Nevertheless, are there any plans to integrate custom tokens into the Nano ecosystem? I think NFTs would be a valuable addition, to store giftcards or tokenised belongings in your wallet.

Probably not. The goal with Nano is to be peer to peer digital cash and do that in best possible way. Anything else added to the protocol at the first layer will affect that goal in the wrong direction.