Here is a design for your bed sheets that will make them look like stacks of money, specifically the large pile of cash that Huell and Kuby famously laid on top of in Breaking Bad.
The sheets are printed in a way that the front and sides of the money bundles are projected onto the sides of the mattress. It should look good, if the images are aligned properly.
Dave's Geeky Ideas 
Definitely hope you find a way to get this made! It would be even cooler if the pillowcases could be made to look like ziploc bags of blue meth 🙂