I just had an idea
I, like others here, am a memeber of an art site called: DeviantART http://deviantart.com
In spite of the name, I believe that DeviantArt is the #1 art site on the internet.
Well, on DeviantArt, 'we' (or a committee to represent us) could make and stock our artwork in DeviantART for viewing and for sale.
Of course, we'd have to buy an annual "sale" membership. (not much, maybe $30)
They sell printed artwork, posters, mugs, t-shirts, backpacks, mousepads, etc ... the list goes on.
We could have people visit the LinuxMint page on Deviantart, buy the product.
And DeviantART would print up and ship the product to the buyer for a small percentage of the profit.
We'd have to look into the specifics of it ... and get back to the Mint Team/Devs?
And of course, someone would have to keep our page on DA, up-to-date, and add new stuff.
There are a few other website like this that would show and sell and ship our products. (for a fee, of course)
Just a thought . . . ??