Looking for a recipe for grain-free, nut-free, seed free bread?

Kat, you can't make bread (starchy stuff that rises and can be sliced) excluding all those things. Even corn is a grain. If you mean no gluten, rather than no grains, that would leave you more options.

You need to think in alternatives, such as lettuce or kale wraps for burrito or wrap type "sandwiches"; stuffed vegetables (peppers, summer squash, tomatoes, grape leaves, portabello mushrooms or cabbage). Potatoes can be made into pancakes, and are delicious if made with care.

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Is rice or corn ok? How about soy?

Although corn bread isn't really "bread" it's more of a quick bread or a muffin.

Rice flour can be used to make spring roll wrappers like the ones you get from the Vietnamese restaurant, or mochi, a type of dense, chewy paste, usually wrapped around a sweet filling and used for dessert.

There are gluten-free breads that use a mixture of rice and soy products to try and imitate bread...but it's not the same.

you likely could use a bean or potato flour

Wonder bread.