All elder dragon quests give you elder dragon blood:
Offline:
-ceadeus kill/repel
Online:
-Jhen Mohran
-Alatreon
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4*+ Elder quests. If I recall correctly, the Green Plesioth awarded Monster Bone+.
The answer elder furi foil card
3 {or 4 if you believe in herobrine} the 3 are Ender Dragon, Wither and the Elder Guardian
It is in mission 9 and its at the back of elder furi's hut besides loads of books
You cannot on the PS3 but it is possible on the PC. There is an option for Blood Decals on the Options menu which lowers the amount of blood on the weapon or ground.