Caskets are not items which can be easily promoted. Custom caskets are even less easily promoted. To actually promote your custom caskets in a more positive or fun light, here are some options that could help.
Halloween Haunted Houses
As long as the agreement you make with the organizations that sponsor the haunted houses includes no destruction of your property, you can feature your custom caskets in this seasonal entertainment. At the very least, it would give attendees an idea of the many options of unique caskets they could purchase as their own resting beds. Some of your more Goth customers might even enjoy your displays of casket artistry via this form of Halloween amusement.
Investment Trade Shows
While an investment trade show may seem like an odd place for a custom casket display, it actually is not. Customers are investing in their futures, and caskets are an investment as well because they are costly and a part of everyone's imminent end. It is easier to convince investors to look at and purchase a custom casket here than you might think, especially if you take custom orders and offer a payment plan for every casket you sell.
Work the Funeral Home Circuit
Most funeral homes purchase their caskets from manufacturers. However, most funeral homes get their caskets from manufacturers because the sales representatives from manufacturers make frequent visits to the funeral homes to offer them new products and new lines of caskets and coffins. Sometimes when you start a business (such as the one you have right now) you will need to do a lot more footwork to get things going, and that includes working the funeral home circuit to get a good client base. Some funeral homes might not favor an unusual line of custom caskets, but others may be more open to the idea of providing a unique burial experience for their customers.
While some might think it a tad morbid to put your custom caskets on display at an art fair, others may appreciate the master craftsmanship you have put into your caskets. Since there are usually no restrictions whatsoever to what can be on display at an art fair, this may be a good venue for you. If you focus on how death can be as beautiful as art in life, this may be your lead-in to sell a couple of your original caskets.