- A paint-chatting system, that allows players to communicate through paintings
- New Settings feature: "Render Canvas Mouse"
- New setting: "Save Canvas"
- New "tab" key configuration that allows you to hide HUD elements
- S&box lobby settings (This was already added shortly after the release of 1.00, but it is a 1.03 addition)
- Updated the base look of the game
- Canvas rebuilds now focus more on the joining client than already-joined clients
- Changed the positional sound of the brush from mouse to screen
- Background layer not being able to be hidden
- Network players accidentally copying the host's brush settings after joining
- Servers setting was previously using the wrong server name, so that's been fixed