I pull out all the rarely used fancy glassware I have to fill with yummy snacks and chips for my holiday parties. I think it adds a festive look to the table and is an inexpensive centerpiece. Don't you think so?
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For my high school reunion, I made a centerpiece using a few stacked "presents" wrapped in graduation-themed paper and ribbon in our school colors. My presents were empty, but you could put anything you want in them, especially if the party is for an individual.
An inexpensive and cute centerpiece that I did for a birthday party was using the 32oz chinese take out containers! Since they are white, you can decorate it to your decor.