The first background project I completed was When Fortunes' Collide which basically is a game that you need to get gifts while being chased by ghost while controlling a shark.
Link to my project: https://scratch.mit.edu/projects/1223320382
The second background project I completed was the Rock, Paper, Scissors game where if you press 1 it is completely random and if you press 2 you get control one of the people.
Link to my project: https://scratch.mit.edu/projects/1232283923