I actually just saw the magazine in Barnes and Noble today, so you can still get a copy if you haven't yet. Anyway, I've tried to use tea tins in the past as a flower centerpiece. I used oasis the last time and poured water directly in the tin. I had problems with leaking and the florist tape not holding the oasis down and it floating out of the tin. But now after reading the magazine:
Ta-da! And the secret is just putting a small cup or vase inside the tin. This is common sense, I know, but it never occurred to me! I used a small sour cream cup I had kept.
Here is a different shaped tin:
Too cool! I know what I'm going to have on the table the next time I have a tea.