You can create a customizable blank floorplan to your Venue Library by accessing your Venues tab.
Select New Venue. Enter in the Venue Details for your floorplan. Hit Next.
Under Choose Pattern and Set Dimensions, enter in the dimensions for your blank floorplan in the blank fields. Hit Next.
Enter in any additional information for Wall Texture, Pattern and Ceiling Height. Hit Save.
You can pull up your Venue at any time from your Venue Library or in Room Settings.