It’s a treat that could have been invented for Instagram: five colorful kinds of ice cream (orange sherbet, pistachio, strawberry, chocolate, and cherry- and walnut-filled Palmer House) layered atop a cake cone in a joy-inducing, vertiginous tower. Only thing is, the Rainbow Cone has been around for about 95 years. Indeed, little has changed inside the pastel-hued building on Western Avenue since this South Side ice cream purveyor moved to its current location from an even older roadside stand across the street decades ago. It just took a while for the influencers to catch up. $5.99/large; 9233 S. Western Ave., Beverly; 498 E. Roosevelt Rd., Lombard