We spotted the above chevron wall over on Design Sponge. Stephanie walks you through the process step by step on her site. It seems pretty simple, though we're certain we might still make a mess of it if we aren't careful and patient.
She also did these birds in a past apartment.
This seems like a great DIY resource for the nursery or kids rooms. One thing to note is that Stephanie says her walls were lath and plaster- not drywall and that if you do have drywall- you might not want to attempt this one.