Just wanted to share a photo of the Fountain I made using Rhurbarb leaves.
You will need a large table, large pieces of plastic. Play sand I am not sure how much, but a large bag. Place the plastic bag flat on the table. Take the sand and form it making a dome. It will need to be enough for the leaf to cover. Sand should be heaved up in the center.
Place the leaf over the sand, leaf should be out to the edge of the sand. Place leaf so that you are looking at the veins. Vein side up. If you tear it you can patch with another leaf. You will notice in the center of my picture Ii have an indention in mine. You don't have to do this step but I made these as butterfly puddler's and this held the sand. If you want to do this step I used a small round plastic butterbowl, and cut a round hole in the leaf towards the top of the leaf, and pressed the bowl into the sand to form the indention. Make sure you cut the leaf to fit the bowl only, and no more.
You will need a 40 lb the bag of concrete mix. Do not use with stone in it. Mix the concrete mix, should look like thick cookie dough . Start placing on the leaf, placing and pressing as you go. Follow the pattern of the leaf. When you are done cover with plastic and allow