I used part of the "Laundry App UI Kit Sketch Resource" design that was designed by Satheesh Kumar at: https://www.sketchappsources.com/free-source/3397-laundry-app-ui-kit-sketch-freebie-resource.html to create a quick prototype

This prototype showcases a new Proto.io feature called Gradients, it’s a new way to create and animate gradients straight in Proto.io. You can now make your UI pop with vibrant linear or radial colors, and bring to life with beautiful animations.

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Lets babies mix and match and make all kinds of silly halloween characters. Images from: https://www.comofazeremcasa.net/brinquedo-com-blocos-de-madeira-para-criancas-com-moldes/

A simple animated Flowchart. Click on each tab and the arrows when zoomed in to transition to the next one. Design credited to: https://www.sketchappsources.com/free-source/3636-entity-relationship-model-erd-diagram-library-sketch-frebie-resource.html

Basic To Do prototype based on: https://www.sketchappsources.com/free-source/3625-basic-to-do-app-design-sketch-freebie-resource.html

This 18 Cool Gradients was designed by Osama Dawood https://www.sketchappsources.com/free-source/3607-gradients-ui-kit-sketch-freebie-resource.html