If you have an idea for dropshipping a unique item and you’re sure no supplier sells it. You can  go to sites like Aliexpress and ask a supplier in your niche, if they can improve an existing product or create a new one to meet your specification. Usually they would require an MOQ (minimum order quantity) to be able to design a new product or redesign an existing one for you. I do not recommend this if you're only starting to dropship, you should try to source an existing product that you can sell profitably.