As annointed said, you change color due to the hemoglobin in your blood turning into methemoglobin. You may also have vomit on yourself if you get it on you while conscious, or from vomiting while unconscious. But aside from that, it is a better scene than the other methods you mentioned. But do note, you will still be a corpse, and not a pretty one. But regardless, your family will still be traumatized. It's just a fact you have to accept if you wish to move forward with this, it's something we all have to accept for those of us who live with others. If you're unable to execute your plan away from where they'll be, then you could try writing some warnings for them not to enter wherever you happen to be and to call emergency services.
