Lego X-files (think, a game per season, it would PRINT money, and it can be hillarious!)
Lego Harry Potter (its coming, you know it, i know it, its going to happen)
Lego Lord of the Rings (Again, obvious)
Lego Dragon Ball Z (it could happen!)
Lego Metal Gear Solid (You know Kojima's humor...)
Lego Resident Evil (hey, they made Indiana Jones Kid Friendly (Movie 2 was the basis for the PG 13 rating))
Lego X-men (I would buy it)
Lego Spider-Man (they did Batman, its possible)
Lego Halo (dont ask me where it came from...)
Lego Matrix (i agree, lego bullet time would be...hillarious)
Lego Friday the 13th (it could happen)
Lego Homestar Runner (I would LOVE Lego Strong Bad)
Lego Silent Hill (Lego Phead would ROCK!!!)
Lego Star Trek (i would love it)
Those are my ideas for Lego Games