while we wait for a user to respond to you (I have a "basic" 360), you may want to ahve a look at this
thread.
This was befoer the new firmware (I think) but hopefuly both
fbreader with wrist page turn (you can download the latest version
here)and
themes should work, and so should
coolreader (the latest version has wrist page turn, too), though you have to install the "Pro" version as far as I know (the 360+ firmware should be based on the same firmware used by the Pro models, rathher than the old 360). As for the themes, if you get adventurous you can create your own, or modify the existing ones. Once you install the additional readers, you have to modify the configuration file accordingly, but all instructions are in the links above.
There is also a
hacked version of Adobereader that allows you to set your CSS style files.
As I said, I am not sure that all the above work in the latest firmware, but hopefully some current user will be able to tell you soon. Looking forward to your review!