Star trails images are a very rewarding type of nightscape photography. Capturing the movement of the stars as Earth rotates on its axis is beautiful in itself, but when it incorporates a nice foreground it really elevates the shot. The great thing about star trail photographs is that they're very easy to produce and can be done with very basic camera equipment.
In addition to shooting images with the intention of creating star trails, you can also createcapture many meteors or your aurora alert resulted in a no-show, you'll still get a lovely image from the data.