I'd like to see ladders and the ability to make multiple levels. I'd also like to see some pieces for buildings mounted to the platforms (rather than just using a tent or something). Rope bridges (in addition to the wooden ones you already have) would be great, as would rope lining for the platforms (though some none rope lined platform edges would be good in addition to it). Also rotted/disrepaired and mossy versions of the main peices would be nice. (I want to be able to have sections that have been abandoned and fallen into disrepair) Those, combined with whatever decorations you think would go well with it, would make a truely EPIC tileset.