Red, but not because I am boring, but because I like my red skin tone.
If I had green blood, for example, then when I blushed or was hot my skin would take on a green tinge with I don't think would look too good. I think it would be the same with any other colour blood, your skin would look weird and very possible off-putting when blood was near the surface of your skin.
White or clear blood would be bad too, you'd probably look like a corpse, and black blood would look weird, you'd probably turn grey or just appear really splotchy.
If I was forced to have my blood colour changed, then I would choose a colour that is as close to red as possible, so that my skin wouldn't look weird and horrible.
However, if by some magical bending of the rules of physics, I could have my blood colour changed without it affecting my skin and external appearance, then I would choose purple as it's my favourite colour.
If I had green blood, for example, then when I blushed or was hot my skin would take on a green tinge with I don't think would look too good. I think it would be the same with any other colour blood, your skin would look weird and very possible off-putting when blood was near the surface of your skin.
White or clear blood would be bad too, you'd probably look like a corpse, and black blood would look weird, you'd probably turn grey or just appear really splotchy.
If I was forced to have my blood colour changed, then I would choose a colour that is as close to red as possible, so that my skin wouldn't look weird and horrible.
However, if by some magical bending of the rules of physics, I could have my blood colour changed without it affecting my skin and external appearance, then I would choose purple as it's my favourite colour.