I cut myself a piece of one of the more robust designs (the majority of the pack is of an exceptionally fine and lightweight quality).
I used Very Vanilla card stock as my base layer and used a blending tool to apply a rainbow of colours working them gently across my Delightfully Detailed "stencil/mask". I did unwittingly sneak a retired colour in there - Watermelon Wonder (finding it hard to let go !!!!)
When finished, I cut my layer down to 3 1/4 x 4 3/4 inches and adhered it to a piece of fun foam cut slightly smaller, then stuck this to a Very Vanilla Note Card. Adding a foam base really does make it feel like a quality card.
I rather like how it turned out.
Thanks for looking - and have a nice day.