Marc Silvestri Sketch

Here's a character that Marc Silvestri only drew a few times - Gambit.

X-Treme Unpublished

 X-Treme X-Men had planned to have a series of 6 covers that joined to form one large image.  While Bishop, Sage, Storm, and Cannonball appeared on the covers for issues 20, 21, 22, and 24, the covers for Gambit and Rogue were never published.

Oddly enough, the Gambit cover did appear on the Amazon listing for the 

X-Treme X-Men Volume 6: Intifada trade paperback, although it was not used for the cover.

To date, the Rogue art has not been used anywhere, but finally Salvador Larroca's original art can be seen here!

Unpublished Limited Series - Technet

This art for a limited series that never saw print - featuring Excalibur villains Technet - was published in a Marvel preview book for 1993.  The art and synopsis appear alongside art for the first Gambit limited series, which did see print that year.