I accidentally got the wrong RGB LEDs. They aren't controllable and have a preprogrammed way of flashing

Is there any way I can still access the individual red green and blue diodes to control it myself, or would it not be worth trying?

gif of the LED:

http://imgur.com/a/9RPXO0M

 

The answer is probably NO.

 

Not with only two power leads (unless it uses something like 1-wire protocol.)

 

One wire protocol:
https://developer.electricimp.com/resources/onewire
But not supported by this LED assembly.

No, you are stuck.

 

Welcome to AAC.

What are you using these for? The type of RGB LED suitable for one application will not be for another.