I thought these were stupidly cute. As you see they can be decorated in anyway and can be filled with anything. I see that they put a plastic bag liner inside ones that are to be used as fresh flower vases. They come in 2 sizes, short: 5"x5"x6" and tall: 5"x5"x10". I imagine they would be fairly easy to make yourself.
The last picture is of their bud vase collection, it comes with the tiny "test tube" vase. Again, I think it would be easy to make.