Can i change the colors of the Forms ? using a color which is not listed in Cutom forms window

Customising your forms allows you to modify the details, falconsdws. I’m here to offer an alternative method for using the color you prefer.

With QuickBooks Online (QBO), you can choose form colors from the Custom Forms window. If you have a specific color in mind, you can search for its hexadecimal value and enter it in the color field as a workaround. This way, you can use colors that match your preference.

I've attached a screenshot for your visual reference:

For more details, you can check this reference on how to customise invoices, estimates, and sales receipts in QuickBooks Online.

Additionally, I'm sharing this article that will help you provide your customers with a gentle reminder of their upcoming dues: Create and send customer statements in QuickBooks Online.

I'll keep an eye out for your response if you have any more questions about handling your sales forms and will take care of it right away.