Here's the cold you'll want to catch...OK, I'm bad at marketing.

Viruses, annoying though they can be, have beautiful structures. This one is the common cold in humans, 4RHV in the Protein Data Bank.

Viruses carry their infectious payloads inside symmetrical shells called capsids, and that's what I've drawn here, using an elegant style that shows the helices and sheets, not just the backbone. Inside the icosahedral case there would be a ball of RNA, which is hard to image quantitatively, and which probably just looks like spaghetti anyway.