UI prototyping typically entails iterating and mixing components from examples resembling screenshots and sketches, however present instruments provide restricted help for incorporating these examples. Impressed by the cognitive strategy of conceptual mixing, we introduce a novel UI workflow that enables builders to quickly incorporate numerous facets from design examples into work-in-progress UIs. We prototyped this workflow as Misty. By means of an exploratory first-use examine with 14 frontend builders, we assessed Misty’s effectiveness and gathered suggestions on this workflow. Our findings counsel that Misty’s conceptual mixing workflow helps builders kickstart inventive explorations, flexibly specify intent in several levels of prototyping, and conjures up builders by serendipitous UI blends. Misty demonstrates the potential for instruments that blur the boundaries between builders and designers.