3 Suggestions...

All of which would be really cool if you implemented them.

1) Have the sun change to the moon when the system clock hits a certain time (6?)
2) Link it to a weather service like Yahoo weather or WeatherBug so when it rains outside, it rains on our screen!
3) Snow wouldnt hurt, and you could have the pool freeze over so when you tap it, it cracks (or something along those lines) :p

One thing that needs to be fixed:
-When we drag our finger its like my finger is vibrating on the screen, it needs to be more fluid.

Other than that this app ROCKS!!! Keep up the great work!

cjkonecnik about Reflecting Pool