I already found all that and more. so when i will have time I will realize some of my ideas.
But if you are doing your own props I think you could make just simple raw meat ball with textures and everything so that it would look like piece of severed meat.
Something what looks like this but bloodier
this prop would have lots of uses in our works as it could be used to make severed body parts by simply hiding what is unnecessary and placing that prop where wound is needed.
Tor example if you want severed penis just take plain penis with all remaining body hidden and stick that ball to the severed part and it's all good.