As i said on Abnoub's thread, this idea doesnt work for a few reasons:
1. if you buy blood texture, whats stopping you from just colouring in block void and having void blood, which usually costs $20? this means that the texture itself would have to be more or equally expensive as void blood. making it more expensive would make it too expensive to be worthwhile, but making it equally expensive would just ruin the market for void blood.
2. how would this work? would the blood drops themselves have your uploaded texture on them? or would the blood drops form a picture on the floor? there are problems with both of these:
i. blood particle textures would either have to be so small, they would be glorified pixel art, or just completely lag other peoples games, making them turn blood textures off in the options, and making the texture itself pointless because no-one can see them
ii. 'bleeding picture' textures have a very specific problem: when would you put enough blood on the floor to make a visible, reasonably sized picture?
but now you may be thinking: what about body textures? the answer to that is an actual texture looks much better than block colours, and void primary + secondary gradients cost the meagre sum of $4, eliminating the threat to the gradient market. to mimic a force and relax using joint textures would cost $100 ($5 x 20 joints) + a lot of time uploading the textures, also eliminating the threat to the joint market.
in short, this idea, awesome as it SOUNDS, cannot work due the sheer amount of complications and costs involved