I have always done well with a themed items - Christmas decor items (especially ornaments), fall decor items, Easter decor items, 4th of July, etc. Think seasonal decorations, hostess gifts, family or friend mini-gifts, office desk keepsake etc. and think about what you would give or like to get.
Fit your products to the season and group by color/theme not by type of item. They display well at your booth and people know 'why' they are buying the the item they choose.