Google's Gemini AI SMASHES Sellable T-Shirt Mockups in 30 Seconds (Nano Banana)

About this video

The creator walks through using Google’s Gemini 2.5 Flash Image, called Nano Banana in Google AI Studio, to create t-shirt designs and mockups. He starts by picking a sellable niche from trending research — in this case a Halloween ghost with flowers and checkered elements that he says is a bestseller, aimed at groups like teachers, librarians and book lovers, and shown with EverBee data about a month and three weeks before Halloween. He uses ChatGPT, including the free version, to turn a reference image into prompt ideas, copies a prompt into Nano Banana to generate different variations, and stresses making the result different rather than copying pixel for pixel. He then edits designs with natural language, for example changing a hat color or flower type, and creates mockups with prompts such as placing the design center chest on a t-shirt with studio lighting and realistic folds. He shows using your own mockup, generating four colorway variations in a grid (mono, sunset, ocean and neon), and creating lifestyle, flat-lay on a wooden desk, and e-commerce white-background mockups, fixing problems by telling the model to face the model forward and put the design on the front. He says the tool works with third-party print providers and for Etsy, Amazon, websites and digital downloads, and promotes his Top Research Design Vault service.

Key takeaways

• Start from proven demand: pick a trending, sellable niche first using research/EverBee data before generating any design.
• Use ChatGPT to turn a reference design into prompt ideas, then generate variations in Nano Banana/Google AI Studio instead of copying the original.
• Edit with plain natural language in Nano Banana — change hat or flower colors, add or remove elements — to make a design distinct.
• Generate mockups from prompts or your own mockup image, including studio, lifestyle on a model, flat-lay, and clean e-commerce white-background styles.
• Batch test variations, e.g. a four-way grid of mono, sunset, ocean and neon colorways, and correct errors conversationally such as asking for a forward-facing model with the design on the front.

Episode details: published September 11, 2025 · 10:10 long. Summary written by Self Growth Videos from the episode itself. Business results and any income figures mentioned are RJ Martinez’s own claims, shared for education — they are not typical or guaranteed.

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