Tnx!
There are many, many mixes for blood around the web, but I still use one that I found out a couple of years ago. It's simple, yet gives good looking results. It's GW Blood Red and GW Flesh Ink in 1:1 ratio. Sadly, Flesh Ink is discontinued at GW, but you can try any similar ink, from Vallejo for example. The ink gives it great thinning and a slight gloss effect, so you cut your work there too.
The splatter can be achieved in many ways, depending on it's source, ie. what kind of damage you want it to represent. Wyrd Chronicles V2 had a fantastic article on painting Killjoy that also discussed ways for achieving blood splatter. In a nutshell, you can drybrush the blood on a weapon for a cutting effect, you can sprinkle it, you can load your brush, then blow it on the mini (very messy!), you can dab it to create smudges, you can load it on a sponge and dab with it.... my best advice would be, don't be afraid to experiment, and less is more.
I hope that helped.
Cheers, Miljan