Cafe Press now have Sigg bottles. If you're new to Cafe Press, you can either upload your own design, buy a design from a store, or open your own store to sell to others.

The Silent Samurai Sigg I designed and ordered for my husband.

In case you're interested in Cafe Press.....
I've had my own Cafe Press store for a few years now, but have to confess, I haven't done much with it. I occasionally get a spurt of enthusiasm and tidy it up a little, and add new designs and products. It does seriously need some time put in it if I wanted to make decent dollars from it.
It's a site where you can upload designs and images and put them on products of your choosing, products such as t-shirts, clocks, bags, cards, magnets and now Sigg bottles. You then choose your markup and when someone purchases one of your designs, you get paid that markup, like you would a royalty. I think if you're a talented designer and regularly promote your store, I imagine you could make some nice pocket money, maybe an income, I'm not sure.
For me, I've enjoyed getting a few extra dollars here and there. I've never had a payout, but instead have used that credit to buy from my own store when they have their periodical 20% Storekeeper sales. For now, I hope DH will like his new Sigg bottle.