It's a fun place to photograph, especially as different weather changes the mood of the images. It can also be challenging to find a good composition: blending the foreground with the canyon to keep a sense of depth in the image - a difficult thing during clear weather with limited visual clues from haze.
In this first image above I used the various patches of sunlight and shadow to differentiate between cliffs and the mountain behind, while in the second image below I used the approaching rain.
Which image do you prefer?