Different styles, brushes and filters for an image in photoshop.
s you can see, it starts with a simple black and white picture, it's more grey.

If you add filters and / or background shades, the result is very separate in its own ways, a warm filter results in a slightly colourful and human like image, a cold filter like some blue shades are the more Techie way, interessant is the mixing of both styles, this way we have a warm and humane "look&feel" with a tolerable tech touch.

If you combine black background with the #990000 red, you'll get an insane picture at the end, see dna 10.

The same with the brushes, use in different layers, styles and filters, so you're getting various results.

Variations of an image