I think the mirror image reference is a little faulty. To continue Hyp's snipe hypothetical, if a blind caster was turned into a snipe and cast mirror image he would create duplicate snipes because that's what the spell does. (If the mage has a "Kick Me" sign on his back he doesn't know about, MI duplicates would have it. Kind of a funny way for the mage to find out about it, actually.) But you still couldn't make a Minor Image of something you'd never seen, at best it would look like whatever default mental image your mind creates. (If I were casting it, my minor image snipe would look like a opossum, perhaps with a little hat. I don't know why, that's just what I'm seeing.)
I'm not entirely sure if its possible to create an "invisible" illusion, or an illusion you'd need See Invisibility to see. If that's what you wanted, I'd think you'd need to cast Invisibility on the illusion. (I haven't put a lot of thought into this, but these are my first impressions.) But I don't think a caster has to include all the elements of an illusion, so if they wanted to cast a Major Image without a visual component (or thermal, or sound) they could. So a caster could create a sound and smell illusion of herself, and the players would likely assume she was invisible. A lower tech version would be a Scent Bane ability or spell and Ghost Sound.
I'm not entirely sure if its possible to create an "invisible" illusion, or an illusion you'd need See Invisibility to see. If that's what you wanted, I'd think you'd need to cast Invisibility on the illusion. (I haven't put a lot of thought into this, but these are my first impressions.) But I don't think a caster has to include all the elements of an illusion, so if they wanted to cast a Major Image without a visual component (or thermal, or sound) they could. So a caster could create a sound and smell illusion of herself, and the players would likely assume she was invisible. A lower tech version would be a Scent Bane ability or spell and Ghost Sound.