To add to the previous idea if you are an arist paint them some pictures. If you are great with plants give them some easy starter plants or set up a flower bed from your or others excess bulbs. (Check out free plants under Gardening topic.) If you like to clean, iron or do other household chores use that as your gift. And if you are without any giftable talents (in your opinion) then have movie or card night at your house. Provide the drinks (kool-aid works) and have them bring their own snacks. A nice homemade card can be the gift, just include your service that you are offering as the rest of the gift in the message.