I recently came across this impressions in clay tutorial over on Garden Mama. Whilst I didn't follow the tutorial, I was inspired by it to create my own clay ornaments!
I used white air drying clay, and rolled it out between two layers of greaseproof paper, like you might with biscuit dough!
I experimented added different items between the greaseproof and the clay to create impressions - some were more successful than others! Here are the different items I tried:
The only impression I really liked is the plant to the right of the stars - it was thick and dense, so gave a really deep impression. The other plants and the stars simply did not give a deep enough impression to look effective - not for this project, anyway! (And have you ever tried picking star confetti out of clay? Not fun!)
I cut the shapes out with biscuit/cookie cutters, and threaded some with string and some with ribbon.
This was a really fun project to do, with some effective results (some more so than others!) It would look great with different coloured Sculpey/Fimo too.
Why not have a look at the other crafts in my Christmas category...