Hi @Elad_Tan, welcome to the Community!
Ah, I did some checking and it looks like the Google Sheets app isn’t currently able to set the background color of cells in a row. There’s an existing feature request open for this though so I’ve added your vote to that. I don’t have any ETA on when that might become possible but we’ll be sure to email you as soon as it is. 
In the meantime, I wonder if you could use conditional formatting within Google Sheets to set the alternating colors? 
                
     
                                    
            I can, but i want the orders populated automatically with the formatting. Any ideas how to do it? It doesn’t have to be the background color..
                
     
                                    
            Hi @Elad_Tan,
Unfortunately, there isn’t a workaround for this at the moment. The only solution here is to wait for the feature request to be implemented. However, you might want to consider consulting with one of our certified Zapier Experts to see if they can help you create a custom integration that meets your specific needs. You can reach out to our Zapier Experts team by clicking here: https://zapier.com/experts.
We understand that this can be frustrating, and we apologize for any inconvenience caused. Please don't hesitate to reach out to us if you have any further questions or concerns. We're always here to help! 😊
                
     
                                    
            Hey all, just circling back in to share that the feature request has been implemented! 🎉
A Format Spreadsheet Row action has been added to allow you to update the background color as well as other formatting settings for a spreadsheet row:

Thanks for your patience, we’re excited for you to give this a try! And if you run into any issues with it, feel free to start a new topic or contact our Support team directly and we’ll be glad to assist.
In the meantime, happy Zapping! ⚡