I used Adirondack spray colour washes plus a spritz of mica powder in water to blend the colours and add a bit of glitz. I love those sprays but they are sooo messy so I put the card into a box lined with paper towels before spraying to contain the mess.
When I have finished the paper towels were soaked in ink but actually looked quite pretty so it was a shame to throw them away (so I didn't!) Instead I sandwiched them between sheets of white card - rubbed the card well so that they were nice and flat and left overnight to dry.
Here is the result. They have a really nice texture.