If you want to do more with the stock camera on your T-Mobile LG G2x, take a look at XDA forum member flexnix‘s DIY fisheye lens attachment.
The mod is completely removable as proven by the XDA member who has just used the same lens attachment from his Samsung Vibrant and attached it to his G2x (photo is of the Vibrant).
The lens has a magnetic ring on the rear which needs to attach to a ring on your camera which will need adhesive applied.
The forum member has mentioned only one issue in that the flash will be semi-blocked.
For more information, including lots more example photos using the lens, head on over to the modification thread._________