Identify set for Star Wars parts, dark grey base with 4 studs and embossed Star Wars logo
This is Tile, Modified 6 x 6 x 2/3 with 4 Studs and Embossed 'STAR WARS' (30566):



It appeared in 4 sets back in 2000, always in dark gray. The sets are:


3340-1 Star Wars #1 - Sith Minifig Pack
3341-1 Star Wars #2 - Luke/Han/Boba Minifig Pack
3342-1 Star Wars #3 - Troopers/Chewie Minifig Pack
3343-1 Star Wars #4 - Battle Droid Minifig Pack