There are plenty of banners available at party stores that you could hang near the entry way of your home or even outside the front door. You can make a banner too, if you are the artistic type. A metallic banner can match a more sophisticated theme. If you are having a party where there will be lots of kids, consider having them make the banner as well as the noise makers. All they will need to make a fun banner is a large piece of construction paper, stencils, and markers.
Centerpieces on the tables are a nice touch that can really make your decorating stand out. There is no need to buy one already put together, because there are plenty of ways you can put together a cheap centerpiece yourself that will look great. Floating candles shaped like flower blossoms in glass bowls can look great, just add some glass rocks to the bottom of the bowl in a color that matches your theme. You could also just use a simple bouquet of flowers as a centerpiece in colors that match your theme. Or, place several pillar candles on a pretty plate and fill the gaps in the plate with small clear Christmas ornaments with the hooks removed. The idea is that the clear ornaments will look like bubbles. You can vary this idea by using champagne bottles in place of the candles, or you can mix the two up.