Creating a draft PNG wallpaper product involves several steps. Here's a high-level overview of the process:

1. Design: Create a design for your wallpaper using a tool like Adobe Photoshop or GIMP.
2. PNG Conversion: Convert the design into a PNG format using a tool like ImageMagick or online converters.
3. Draft.js and Markdown: Use the markdown-draft-js library to convert the PNG image into a Draft.js block, which can be used in a markdown editor.

Here's a brief snippet of how you could achieve this:

const { draftJsBlock } = require('markdown-draft-js');
const marked = require('marked');

// Load the PNG image
const pngImage = require('./image.png');

// Convert the PNG image to a Draft.js block
const draftBlock = draftJsBlock(pngImage);

// Convert the Draft.js block to markdown
const markdownText = marked(draftBlock);

4. Product Creation: Use a tool like Medusa to create your product, and integrate the markdown text with the draft-order plugin to display the wallpaper.

Note: This is a high-level overview of the process, and you may need to modify the code to fit your specific use case.