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OK Invent this

So here are a few ideas I’ve had for inventions that I can’t figure out.  I figure that since someone is always beating me to the punch, I might as well share the things that don’t exist that I can’t figure out myself.  If you do figure one or more of these out and become rich, could you at least acknowledge me for the ideas?  That’d be nice.

• Air Conditioned Pillow
  I know that I’m not the only one in the world that likes their bed pillow the most for those first ten seconds after laying on it while it’s still nice and cool.  Then it warms up to your body temperature and depending on where you live may start sticking to you.  I would pay good money for a pillow that stayed cool all night long.
• Digital Currency Converter
  I typed a lot on this entry and got pretty detailed.  Then I decided that maybe this one was possible after all.  So I’m not posting it just yet.  I just need help from someone who really knows electronics….
• Pollution Eater
  After living in a pretty polluted city like Hong Kong for a while you start wondering two things: ‘How can this be cleaned up?’ and ‘If I fall in the harbor will my flesh melt?’  So I started thinking about all the new advances in nanotechnology and biotechnology and I’m wondering when we will be able to make a little nano/bio critter that can not only clean up pollutants but breed to make more of itself but also have a short life-cycle.
  The trick would be to introduxe said organism/machine into a polluted body of water.  It would basically ‘eat’ pollution and use that food to create two duplicates of itself and then die.  The ‘offspring’ would then go off and do the same thing and continue the cycle and exponentially increasing their numbers in an outward radius leaving pollution free water in their wake.  That’s also the reason they need a very short life-span so that once an area is clean, the nanos stop eating and thus stop breeding and die.  Sure there would be the equivalent of an extra thin layer of silt at the bottom of the body of water as a result, but at least it would be clean water again.
  This is doable, but I am in the wrong field for this sort of thing.  An airborne version for air pollution should also be possible but the logistics and locomotion are much more difficult.

OK actually that’s all I can remember at the moment.  Of course there are other things like self-powering electro-magnetic propulsion and anti-gravity and invisibility but I was trying to be somewhat realistic.

If you were going to try and invent something, what would it be?