I’ve done small custom sets for clients, and pairing them with something that sets a cozy vibe helps the gift feel more personal. I’ve used https://nothingbutscents.com/products/amber-incense to add a warm scent to the package, and people mentioned it made the whole thing feel thoughtful. For the LEGO part, local print shops can do custom boxes, and BrickLink sellers are usually open to bulk orders of specific pieces.