More and more people are making outdoor ovens in their backyard, garden or porch, as they have realized how it becomes a heart of a garden or porch. They manage to serve two purposes, as they make your backyard interesting and it enables you to have quality homemade pizzas.aking outdoor ovens using recycled materials is in vogue these days, as people derive pleasure and pride in doing something green. Here are the most common outdoor ovens you can also build: