Sandwich the leaves or flowers between watercolour or mixed media paper and run it through your die cutting machine. FYI you may find a lot of liquid comes out of the leaves, this is why you need paper that will absorb the water.
I rummaged through my garden looking for a mix of fall colours to play with, different greens and reds. The colours transferred from the leaf is a lot lighter than the leaf used.
I'm linking my first card up with CAS Mix up and added a little bee from Lavinia and a sentiment from Magenta.
Card Recipe
Stamps: Sentiments from Magenta (Thank you, Every Season, Happy Birthday), Thanks so much - retired Rubbernecker stamp, Bee from Lavinia
Paper: Mixed Media, 110lb white, Textured Black, Black
Ink: Versafine Clair Nocturn
Accessories: Leaves, Square die
Techniques: Plant pressing, Die cutting