InvoiceOcean gives users the option to choose from 7 invoice templates. You can easily find them all by going to the Settings > Account Settings > Invoice Templates. However, if none of them meets your expectations, you have the option to create your own.

To do this, after going to the Invoice templates tab, scroll to the bottom of the page and press the Add new template button. Templates are created in HTML and CSS using Handlebars.  Sample functions and templates can be found in the documentation on GitHub.