Hi,
Few people wanted to have bloody alternatives for some of mine asset packs (link in signature).
I’d like to encourage you to experiment, change and modify to make your game uniqe (honestly, do you wan’t to see everywhere the same bloody axe/sword with EXACT blood stains?)
This is why I made a very basic tutorial for you, here’s the link, I hope you find it useful 
Agree 100% with your decision to keep your assets as they are. And nice tutorial except for the stock blood images you used.
Make your game even more unique by creating unique blood splatter images.