I found this really cool idea for candle centerpieces.

I have three questions.
1. I found cardboard cupcake stands that you fold into shape, but I'm afraid to use candles on it because I don't want a fire hazard. However, from the picture, it looks like the candles wouldn't be under the next tier. Would I be asking for trouble? Cardboard would be about a third of the price of a regular cupcake stand.
2. Do you have any ideas to give this centerpiece a little punch? It's pretty but I feel like it needs a little something. But I dunno what.
3. Do you lovely creative ladies have any other ideas for a non floral centerpiece? I'm really drawn to candles, but I don't want the "standard" candle centerpieces (i.e. a cylinder with submerged flowers and a floating candle. It's pretty, but it's not me, y'know?)
Thanks!