If you’re looking to diversify your shop a bit into additional revenue streams you may want to explore doming. Roland and other suppliers offer kits to dome everything from lapel pins to vinyl lettering.
In certain circumstances doming can add an additional dimension to an otherwise flat product and move it up a notch or two in intrigue and class. It could also provide an opportunity to provide a companion product to an existing order such as say, domed lapel pins to an order for signs.
A little creativity coupled with a technology like this might provide your shop with another revenue stream.