The venue that we are leaning towards is going to be inexpensive and somewhat of a sentimental value, as it is in the very small home town of my fiance. Unfortunately, it is going to take some very clever decorating to make it look good. It is a curling rink, built into a quonset type structure. It has a concrete floor, but it is not finished inside so all you see is the tin of the structure. I have found somewhere to buy polyvinyl plastic rolls large enough to cover the walls, giving us 10 feet until the "ceiling". But I wasn't sure how to hide the tin roof, and still make it look good, until my mom thought of balloons. Here are some pictures of balloon ceilings I found from Google Image Search...
The next pixctures are other various ballon decor that I thought was cute. The first picture is of a balloon column where they used a balloon and set each balloon at a different level to fill the column, topping it with a large mylar star. In the second picture, they filled the balloons on the floor with helium and used balloon cups and sticks to have them look as though they are dancing along the floor.
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The first picture is a huge balloon drop, imagine that on the dance floor at the last dance of the night... The second picture shows the large 3 (or more) foot wide balloons. I thought they were intersting. Picture 3 is an arch, and Picture 4 is a balloon centerpiece (shown from top view).