When trying hard to find specific fabrics, sometimes Spoonflower has them -- I did find a couple options, sadly most include Santas on jetskis, but there were a couple with just a couple of random jet skis.
https://www.spoonflower.com/en/shop/jet-ski
Spoonflower designs are often personalized -- if the santas don't work it is worth contacting the seller to see if they can do a version without people or maybe just not santa suits... good luck!