There are a lot of themes to choose from. These are some of the more popular light and dark variants. The 3 in the last column are just for fun and making people laugh in presentations. All of these themes are included in the VS Code Can Do That extension pack.
Night Owl Light
Hot Dog Stand
You switch themes by opening the Command Palette (Cmd/Ctrl + Shift + P) and choosing "Preferences: Color Theme".
This will bring up the Theme Switcher where you can choose a new theme from any of the ones you have installed.
You can install additional themes by scrolling to the bottom of this window and selecting "Install Additional Color Theme"