Yes, of course. Please find the steps on how you can customise the branding -
Settings >> Branding. You would find all the branding options to customise it (Icons, Email Templates, App Templates, Invoices templates, Payslips template and Styling).
Here’s a quick look at each tab to familiarise you with the options.
Icons Tab :
Email Templates :
App templates :
Invoices template :
Payslips template :
Detailed explanation about customising the Email/App/Invoice/Payslip templates can be found here.