This, for obvious reasons, applies to your existing client base. But your loyal customers will appreciate it, no doubt about that. Remind your trusted consumer he joined you on this day a year/5 years/10 years ago. Throw in a discount/special offer on his next order to celebrate the occasion.
Or maybe he has an important event coming up, like a birthday, or a wedding. Gently nudge him in the ribs, show that you remember about what's important for him, remind him you are on hand to help.
Another way of making the experience on your website personal for your customers is relying on personalized search: a tool that remembers the visitors' choices, search history and makes more tailored suggestions with every new visit. We've gone over the subject in detail right here