One of my favorite Google logo art designs has to be the "Burning Man" design by Dennis Hwang. It was the logo used to commemorate the 30th anniversary of the Burning Man festival in 2004. I love the way it uses vibrant, warm colors including red, orange, and yellow to symbolize the spirit of the festival. Hwang also cleverly incorporate iconic items like a campfire, the "playa," and the Apple laptop into the logo to give it more of an artistic touch. It's an extremely memorable logo design and it captures the essence of the Burning Man festival perfectly.