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Ooo! Everyone loves a party!
This is a protein, though, not a party decoration. The full title of this image (or, really, description) is “Top view of ribbon diagram of ribonuclease inhibitor (PDB accession code 2BNH). Made with MOLMOL.”
MOLMOL is a piece of software – you can find it here, in fact – that lets you study molecules after learning their structure using a kind of spectroscope called an NMR (for “nuclear magnetic resonance”) spectroscope. Feed the NMR data into the software, and you get party streamers. MOLMOL is especially good for “biological macromolecules” like this one.
Ribonuclease inhibitor is a thing that’s in a lot of our meat-parts – this specific one seems to be a “porcine” variety, so you’ll find it in your bacon and sausage. Or a friendly neighborhood pig, if you’ve got one. This molecule is in all the cells, telling RNA how long to stick around (or not).
I found this on a great page of ribbons and confetti on Wikimedia Commons