One of the best things about promotional usb memory sticks is the fact that you can customise them they way you like it. The sky is the limit here. Whatever you have in your mind, you can easily convey into a design and then turn it into a flash drive of your dreams. I have seen some very nice, cute bespoke flash drives and look so cool that I would be willing to carry them with me wherever I go and show them to all of my friends around. I am sure that your customers would certainly appreciate such a gift as well.
When designing your perfect bespoke usb flash drive, make sure that it is going to reflect the nature of your company. For example, if you own a car dealership, you can design your memory stick to be in the shape of a little car. If you manufacture shoes, your usb drives can come in the shape of shoes, etc. As you can see, all you need to do is to allow your imagination to run wild, and you are on the right track to reminding your customers of who you are and what it is that you can do for them.