The official pastaOS app template is here! You just need to turn the .sprite3 file of the app components into data URL and save them as .pox files to put in a .poi file for the Pear App Store. Your app, your choice. Multiple sprites are often multiple .pox files. This app template has been updated for pastaOS Misua.
Make sure to use flat and abstract vector designs if possible and keep them within the white square (or change the square's colour if desired). Instead of moving the button itself, make sure to move the button's costume object instead as its center follows the center of the window bar at all times. Once you put it into pastaOS Developer 20, make sure to change all text to the included "Ramyeon" font and then package it into a .poi file when you are done with your app.