Question-Blezier curve

Hi to everyone, I am a new user of blender and I would like to ask if someone knows how to do a polymer network. Here are some examples:

I am not sure how to do it, I hace tried to do a blezier curve and then mesh it to an object but I can not change the color or the thickness…is there any better idea or suggestion?

Thank you very much!!

Verónica

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