Is there a way to make any positive number (income) green (or different color)?

[altered-ego]

1. Open your spreadsheet
2. Select the range of cells that you want the formatting applied to (both negative & positive)
3. Click Format in the main menu
4. Click Conditional Formatting from the drop down menu
5. Apply the desired rules in the right hand side block

• Google help article 78413: Use conditional formatting rules in Google Sheets
• G Suite Learning Centre: See data changes with conditional formatting