You don't have to get it to design it. Have you seen the BJD (ball-jointed dolls) with "tattoos"? If you get good at it, you can make money at it - but some people are very talented, so there is competition. That is not an inexpensive hobby either - although you can practice on dollar store dolls for design.
Design can really eat up your time when it interests you. But I guess that's true of anything that really interests you.
If you're like my husband, easily bored, then multiple hobbies and interests are best. He skips from one to another, but he comes back to them and does get things done. I'm impressed with what all he's accomplished over the years.
You know the more fun you have, the more fun you'll be to your husband. Try different things and keep at the ones you really like.