The auction, which concluded on Wednesday, consisted of three of the images, including a pixelated avocado that fetched more than $100,000 and a design that appears to be derived from a mushroom in the Super Mario franchise that sold for north of $240,000, according to Derek Parsons, a spokesman for the auction house. There were 148 total bids across the three lots, and more than two-thirds of all bidders were new to Sotheby’s.