What thank you gift you choose to send your client will depend on the nature of your relationship, the reason for saying thanks, and the level of investment that they’ve had in your business.
For example, if you’re choosing to celebrate the completion of a recent project which has come as a result of a client referral, you may wish to send a token of your gratitude to the client. This could be as simple as a bottle of wine with a branded corkscrew.