Anyway what you need to do this is:
repeating pattern stamps
Watermark type ink pad
Embossing powder - as it turns out Jewelled Gold is much brighter and better for this than the darker gold I originally tried.
A heat tool
Then let the magic happen with your heat tool
Then you have your faux patterned vellum. It is slightly more opaque than the real thing but not so you would notice when it is used on a layout in my opinion. And it would have been even better had I discovered the Jewelled Gold powder when I first gave this a try and created my layout. But there you are!
I'll be trying out all sorts of different powders and stamps in the future as this is such a quick and easy thing to do
Here is the layout I made. The piece in the top left corner is another faux vellum using a word based background stamp
Aqua Stickles were used to change the colour of two of the Thickers
The addition of a little sparkle just changes how the same papers from a kit can look