For fun, I've decided to see if I can make a digital wallpaper, in all sorts of sizes, for phones, tablets and desktops.
This "product" is a 25Mb .zip file, containing a single ghost design in white on black, gold on black, and black on white. In various aspect ratios, at least one of which will be close to what you need. Unless you have an ultrawide monitor, but I did think about it.
You still have to go through the checkout process (because that's what Shopify wants, use a fake address if you want), but once you've done that you'll be given the link to download the files, there is no charge for this item.