Having been a small business owner in the applied arts field, I say consider the cost of your materials (including a portion of bottles of paint, glue, etc.) and the time you spend making them (including the shopping and the gas to get there/back). Decide what you think is a reasonable hourly "wage" and then add packing materials (and time spent packaging), because etsy buyers get cranky when you charge more for shipping than the actual shipping costs.
I bet you could see these and especially DotD versions very well on etsy.