Weekly Informal Challenge number 209 is "Night Lights":
Challenge yourself this week with some Night Photography. Look for strong contrasting images often provided by the natural negative space at night. Let the slower shutter speeds work to your advantage. Night photography can offer beautiful light trails, creative motion blur and lens aberrations for your creative use. Please keep it FRESH. For you participating in the "40 Things in April" challenge, this provides a nice bridge to work on both at the same time. Remember (most of all) HAVE FUN.
(link to guidelines if needed)