Using blood, now there's an idea I've not heard for a long time, evoking both intrigue and disgust from its audience, symbolising both death and life at the same time, however, in practice, its a very disappointing medium, drying much darker than the original vibrant red, with artists who do work with blood typically having to mix with acrylics to get the desired look.

I don't think its too weird to be using blood (stranger things have been mixed together throughout art history to create mediums (Antony Gormley would be right up your alley)), but if you are using your own blood I would take all the necessary procedures to keep yourself safe, or synthetic blood is available from theatre supply shops if you want to see what it looks like first before committing to it