L.M.
I don't ever watch the show but I've got a couple of ideas from martha stewart....she might have something on a website. my standard is a large glass round bowl filled with fruit that represents that season, then fill with water and add tall matching flowers or complementary color ( oranges with yellow glads or red apples with white tulips, etc)...I hope this makes sense. It's a simple centerpiece that looks fresh, colorful and eye-catching.