get a little bit of paint on a brush or knife and fling (in a slashing motion) it at the console, creates a splatter effect... make sure that if using something other than spray paint that you get the consistency to about that of actual blood, so not super thick but not too thin...
If using spray paint on your console then you can spray some into the can's cap until there's a little pool and then fling it at the console
Definitely practice it on some cardboard or something before you do it on a console though, get a little practice in and experiment a little to get the technique right...