WOOOOOOH WOW! Yes I think this is a wonderful technique and a big WOW. I love it! We did this at the Mega Christmas workshop, I know it's not a Christmas card but I always provide 2 fall card at this workshop. Okay what you need is Chocolate chip or Early Espresso card stock. Stamp your leaves with bleach, lets dry then using a cotton ball apply some pastel to add the colors on the leaves. You will see t=in the video how simple it is to do but turn out to be a WOW card. Trust me on this one it look so good in real like it's a must try it out! Come see the video and then go try it. PS after you stamp with bleach make sure you wash your stamp very good with hot water and dry it good.
On this card I use Old Olive, Cajun Craze and Early Espresso card stock.