Town Decorations are a feature only in Dōbutsu no Mori e+. To get a decoration, the player must pay Tom Nook and then the decoration will appear at a signpost spot. They are similar to the Town Fund in Animal Crossing: City Folk and serve the same role as Public Works Projects in Animal Crossing: New Leaf. In fact, many of these decorations reappeared as public Works Projects in New Leaf.
The following three decorations could only be obtained via a code on the official website.