Is this what you mean?
Industrial Strip - Hammond, IN
Oh wrong forum...
You are probably talking more like this sort of semi-nightmare:
http://www.riskarchive.com/archive04-3/000001b7.htm
Any time the rate is NOT tied to a SINGLE measure it can be called an "exotic" and the market for these is a FRACTION of the regular fixed-income world. That does not mean that no one wants them, just that you really need to have clear what the rates ARE TIED TO and what the expected / projected return is going to be be -- much wider range than traditional fixed income...