Hi Paul,
I'm please to hear you have been challenged
I made the image using Print to File, steps as follows.
First you need some images of a plain colour to make the rectangle for each day.
You can do this in QU by printing to file:
Set up PTF with a suitable page size and resolution to make and image say of ~ 2000pixels, sRGB
Make the page background the colour required and add the template from any folder - this enables the page to print as a blank, the template will not show.
To make the calender:
Set up PTF with a suitable page size and resolution, see screen shot below.
Make a Custom image size of 6 rows and 7 columns per page, crop on.
I added a thin B type border
Add the plain colour images in sequence, top right to bottom left, using the plain colour images as required.
Open the page editor and add the days of the week as floating text, see screen shot for settings I used.
Finished result as 3rd screen shot.
Print to file and save with a suitable name.
If anything is not clear, please ask again.
Terry