It's great to see how you improved building coasters.
What to say:layout doesn't look to be too original but it looks very well built.
Choice of colours is something special!
Try to stay away from the obvious noob effects that crackle or distort the picture...always just makes it impossible to see what you are looking at. Plus those usually look better in smaller doses.
However, you got some nice effects just messing with colors, hues and intensities.
In particular, though I cant remember the filter offhand, this one gives you a nice output:http://www.nolimitsdevcenter.net/i25581
Same for this one:http://www.nolimitsdevcenter.net/i25495
Last one looks similar to water color but its not. Im not a huge fan of the graininess of the last one which makes it look cut up into tons of tiny pieces.
Personally I would rather take what NL gives ya and work to make it look really realistic. Theres a host of small things you can do to take the somewhat computer generated look of the NL enviro and turn it into something a little bit more detailed.