With your regular clients and customers you should be developing a relationship and know their needs and preferences.
Once you get a feel of who they are and what excites them, you can customise their surroundings to please them.
For example if you are in the hotel sector or hospitality, and one regular client is really into sailing....you place the latest sailing magazines in their room as a gift to take away. ( substitute golf, riding, gardening etc for others).
If you own a bar or restaurant then you can emboss a glass or plate with a customers initials - it's theirs and by default their bar/restaurant too.
Similarly with any business you can repay your customers loyalty to you by tailoring small things to please them and reward them to make the bond and loyalty even stronger. In turn I'm willing to bet that they will increase your customer base for you without you even asking.
