This one uses paint behind the acetate:
but you don't have to - you can just stamp on the acetate and place it straight onto the background and let that shine through:
In all of these I've added in stencilling and then stamped with the grey Gelato that's in the 50's Diner kit.
Everybody was having a go with the Gelato sticks to see what they felt like, as they're quite difficult to describe. After a lot of discussion, I decided to try fixing them with cheap hairspray (a bit like fixing pastels) and, guess what, it works! So thank you to the lady who suggested that one.
Thanks for looking!