I participated in a CG challenge here: http://forums.cgsociety.org/showthread.php?p=8223693#post8223693
...based off this stock photo: http://www.gettyimages.it/license/654728427
I ended up doing my own modeling for everything as well as taking my own coin photos for textures. Everything else like the marble, glass stains and dust are Textures from Poliigon.com.
I used a bullet simulation with Redshift proxies to get all the coins into place.
Rendered in Redshift on two 980ti's.