I love the illustration of Zero by ~realityszfake473!!! I thought it will look great in a wallpaper. So here it is... I hope you like this. Is some want this for some other screen resolution please let me know I'll adapte it for you.
Well, that was my first intent of making blood... so i made a vertical line in illustrator and apply a paintbrush, then a copyed into the photoshop and I made the effect whith the bevel/emboss in the Blending Options windonw But there are other tricks... 1.- you could seach an preexisting image of a blood splat