It's not always possible to paint your reception furniture...okay it's probably never possible. How about straying from the norm and covering your tables with chalkboard fabric? You can buy it here and sew your own. What? too hard? How about the using lightweight canvas drop cloths and painting them with chalkboard paint? Oh come on...lazy. You can just do an overlay ;) But I do have a thing for extra long linens pooled around the table.
Think of all the great things you could write straight on the table! People's names, table numbers, menu, a joke or sentiment. The options are endless!