Blood elves cannot be true druids due to their embrace of the Fel Magics...hence the green eyes and also why Night Elfs can't be warlocks. However OP did give me an idea....what if blood elves became ....arcane-element druids!
This would be your Guardian/Tank form
This would be your Feral/Mdps form
your bleeds would be arcane/life draining dots
This would be your Healing form
and you would heal not by direct healing rejuv like a druid would but by reversing time and undoing the damage in similar manner
This would be your Flight Form
This would be your caster/range dps form
Fel and arcane magics mix better with the arcane elementals so in theory we could be able to turn into them via the "corrupt" druidism of our former night elf descent