Drew Crispin shows an Enron "tombstone" on display alongside his coffee shot in the lobby of Three Allen Center in downtown Houston, January 30, 2002 . [Making such knickknacks was a regular practice at the bankrupt energy giant, one that a group of ex-Enron employees are displaying in an unusual art exhibit. "Enron: A Term of Art'' is the brainchild of some former Enron deal-makers and lawyers who wanted to show off some of their most collectible tombstones and other mementos in a humorous exhibition. Parodying a traditional art collection, each of the items bears a legend describing its history and a tongue-in-cheek title brewed up by the group.]