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Like everyone said, you upload it into an image capsule. Here are some samples: https://www.google.com/search?tbm=isch&hl=en&a...
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One way is to find an image of one you like and put it in as a photo capsule.
I haven't used thick lines as text breakers, but I have used a Celtic knot design in just such a fashion. I liked the result.
Those are images, so you just copy paste them or upload them into the photo capsules of your hubs, and here's an example from one of mine that you can use.
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