JavaFX

It looks like JavaFX might be an option as well.. Looking into that. There are some examples of using JavaFX via Zembly on Facebook - so it should be possible. Of course, that is yet another platform to learn ;)

If I can use JavaFX however, I think I can reduce the bandwidth usage and increase the flexibility... JavaFX seems to be very dynamic (Flash-ish) so I might be able to do things like have a single grass image and then alter it in-browser (trim, feather, etc).