I'm surprised by the quality of some of these Star Wars: The Force Awakens trailers made by fans. Some are so good that they could be made into the official ones for all I care. It seems like all fans are mostly excited by the crusader-type lightsaber from the trailer.
Like this one, by Kode Logic.
This one by Kode Logic is pretty good too:
Maybe my favourite sword one, because its simplicity, by Francesco Francavilla:
Here's one by Charles Tan:
More sword action by Noble—6:
This one by Phil Noto is made in the style of the classic posters, although it lacks characters. We haven't seen them yet, but old Han, Leia, and Luke will be big in these.
And finally some cool posters made before the teaser trailer.
Bonus: Cool illustration drawn by Skyrace.