How do I create good paint splatter effects

I've looked everywhere and come up with decals as my best option but when I shoot at the upper part of the wall the decal extends past the wall. It also doesn't work on more than one object, for example if I shoot the wall near the floor it only shows up on the wall when I need it to show up on both the wall and floor. I'm going for The Unfinished Swan effect https://www.youtube.com/watch?v=ibZoHjt3ENg I'm still quite new to unity and game development but would love some help. I'd even be will to pay for someones work if they were able to create this effect for me.