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

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/

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

Here is an example of a scrollable data table with vertical and horizontal scroll and a fixed header. Data design: https://www.sketchappsources.com/free-source/3706-datatable-with-horizontal-scroll-sketch-freebie-resource.html

2 types of modals / popup examples

Snake animation on Nokia. NOKIA 3310 Mockup from: https://www.sketchappsources.com/free-source/3267-nokia-3310-mockup-vector-sketch-freebie-resource.html

A very basic content shelf component commonly used by TV apps such as Hulu, Youtube, HBO etc. This component uses a fixed focus model where the items in the shelf move into place using key press interactions. Note: Must click the canvas to enable key presses, this seems to be a common restriction with most prototyping tools when building key press focus interaction models.

A simple medium-fidelity e-commerce website prototype built using Proto.io’s ready-made templates.