Almost out of thin air, a vibrant toy store appeared in a strip mall near the corner of Lomas Blvd Northeast and Washington Street in late August. And just as quietly, it will disappear at the end of the year. Color Wheel Toys, a 1,000-square-foot shop stocking a mix of nostalgic and modern toys, is a pop-up store founded by Albuquerque resident and teacher Keri Piehl. "I thought, for myself, I knew I was in a place to do this in a way that wasn't going to be a financial disaster at my end and…