A few weeks back I made this print. I used a very home technique, Tin Foil Lithography. The colour has been added digitally. I have to say it was ENORMOUS fun. 
Here’s another – just the black and white image, no added colour.
Both drawn from my sketchbook studies made whilst looking out of the window of my fav cafe in Colchester.
I love the speed, the thick and unpredictable line. I want to do more!! In case you’d also like to try it – there are many blogs on the technique, or you can come along to Wivenhoe Printworks – http://www.wivenhoeprint.works – we’ll be running more sessions soon.
Natalie Eldred 
I absolutely LOVE these! I really want to learn how to do it – must research online. Wow!
Ah thanks. It’s simple (& cheap) enough to do but results can be unpredictable. Mind you, that’s the beauty of it.