This this a question on how to create a custom brand for all new Nintex forms?
Essentially you would style a sample form on a custom list, remove all the controls, export the form and import it into Central Admin as a form layout. Each new form created will have these styles applied (existing forms are not affected). For a step-by-step guide you can follow this guide: Branding Nintex Forms
Hi Jan, Rob,
Thanks for your valuable input! This was specifically around custom branding of SharePoint sites and how they can affect the Nintex Workflow designer page.
The latest release includes an important change too that allows you to set the OOTB Master Page from Central Admin for pages where the Nintex Workflow designer is opened! (Release Nintex Workflow 2010 18.104.22.168)
Central Admin > Nintex
Workflow Management >> Global Settings >> Master Page for Designer