I love this idea, if done right. The Luigi Bormioli 4-in-1 Covered Plate with Dome lets you turn your topped cake stand into a punchbowl and chips-and-dip or veggie tray as well. Granted, they consider the cake stand without the dome to be one of the 4 uses, but I'll add a fifth (since that is pretty lame): Place the glass dome on a nice wooden cutting board and keep a lovely cheese tray fresh! Or, place blooms under it and make a makeshift tabletop terrarium.
Amazon has it for a steal here. If any readers get this I'd love to hear if you like the quality, having not seen it in person myself, so please leave a comment!