Create an hors d'oeuvre centerpiece that recalls a vegetable patch. Buy a large, deep galvanized-metal planter from a garden-supply center, line the bottom with sprouts, and pour in enough water to moisten them. Arrange vegetables, such as cherry tomatoes, carrots, radishes, asparagus, and cauliflower, in sections inside the container, varying the colors. Serve immediately with herb dip, or cover with moist paper towels and refrigerate up to 2 hours.
It's Crudite Season
Martha Stewart Living, March 2008

I have purchased a' Pullman' Sandwich Loaf Pan (longer) @ a Resturant Supply store and it works well.
My mother-in-law is coming over for dinner tonight and I will definitely try this. She loves this sort of thing. She also loves Martha, since they've both got Polish backgrounds! Once I tell her it was a "Martha" idea, she'll be thrilled.
If you have an Ikea near you, they have something very similar in their plant department.
I have searched high and low for thie planter. Any clues where I can find it?