have you tried the free beta of coolcamera?

while the color on my xv6700 is not purple like yours, mine is of a reddish tint (so simmilar anyway). With coolcamera the colors are great (well it's not like my Nikon or anything, but definitely better than stock).

The free version has two drawbacks:

1) only 5 seconds of video for recording - ludicrous...

2) no button to turn on our flash - I use vjCandella to turn it on and off manually (highly recommended ap for this device - makes a great flashlight).