I'm not sure what this printing technique is called, but Alys Fowler showed it on her Edible Garden programme on BBC2 last Wednesday and I was itching to have a go. You need soft, pliable leaves and flowers, natural material (I used cotton calico) and a hammer. Lay the plant material out in a pattern on the cloth, fold it over so the plants are sandwiched in the middle, then tap the leaves and petals with a hammer until the pattern appears. Then you leave it to dry and finally iron it to set the dye. I'm not sure how colourfast this would be, but it gives an almost watercolour-like result.
This is a pattern using tulip petals surrounded by rose leaves, sycamore leaves, variegated dogwood, a hellebore (top left) and a forget-me-not. You never know what the result is going to be, and the mirror image (ie the backs of the leaves and petals on the top half of the sandwich of fabric) is just as pretty. The colours don't always come out true either - the forget-me-not came out brown not blue. But I like the result.
This is a little viola.
Sycamore leaf and aubretia.
Sage, which gave the strongest colour of all.