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What am I doing?

The adapters certainly work, but the fans will run at 100%. Not so good for noise, but your components will be nice 'n cool!
 
Neither the Newegg site nor the Corsair site make clear exactly what the fan's electrical characteristics are. The Corsair site does say each plugs into a "standard 3-pin fan connector". Two things are not clear though:
(a) Does the fan actually have a third wire (yellow) from fan motor to connector, for sending out a fan speed signal? If not, you can never get a fan speed reading from it, even if it were connected to a mobo port.
(b) How is power to the purple or white lights supplied? If they are just in parallel with the fan motor, then supplying that motor with reduced voltage in order to slow it down would also reduce light output, and shut the lights off at low voltage. This is the effect you'd get if you were to power the fans from mobo SYS_FANn 3-pin ports and try to use automatic fan speed control.

Given those uncertainties, you might be best to simply attach all three fans directly to a constant 12 VDC supply from one 4-pin Molex output connector from the PSU (the type of connector used for older IDE HDD's and optical drives). This would give the fans and lights full power at all times. To do that, the adapter that ketchup79 linked to is ideal - it allows you to plug three common 3-pin fans into one PSU 4-pin Molex output.
 
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