Google’s Nano Banana—officially Gemini 2.5 Flash Image—lets anyone turn plain photos into 3D figurines, retro looks, fantasy maps, and game characters with simple prompts. It’s built into the Gemini app, supports precise edits, multi-image blends, and background swaps, and is already trending with creators and brands. Here’s how it works, what it can do, and the best prompts to try.