Noel Carboni has been putting a considerable amount of effort into developing a new star spike plugin for Photoshop. He has been trying it out on a few of our images as a test and this is the result of working on the deep-sky image of Procyon.
Artificial star spikes are either something you like, or something you pretty much dislike – personally I think they add to an image about 90% of the time with only very few images not benefitting from adding spikes.