DIY raised garden beds are the perfect way to grow vegetables and other produce. Railroad Ties. Recycling is great for the environment, and in some cases can be great for your raised bed as well, but certain recycled materials should be avoided when building your raised bed. You're sure to find just the right raised garden bed plan for your space. Browse raised garden bed plans! Materials to Avoid Using in Raised Beds. Whether you're a novice gardener or you're an experienced pro, using Railroad ties are found throughout the United States as garden beds, stairs, and other landscape features.