This is a coaster made from a picture of an actual leaf from my Monstera Deliciosa.

The top surface could be ironed to give it a really smooth finish. I tried that myself but I wasn't satisfied because of my settings. It still give a nice smooth surface so I use it flipped (ironed side on the table). 

I started by taking a picture of the leaf, then cleaned darkened any “non leaf” area : 

Then passed it through a filter to erase the background and fixed any area where the filter failed :

Then through a black and white filter :

I may add more leafs in the future to add more variety.