This one is probably well known but when chopping trees a brown square is visible around the edges of the texture which represents the chopped part:
I think the icon/image for stone in inventory needs changing, it looks more like coal than the grey colour of the stones we pick up or mine. I realise it may be like this to differentiate it from ores, so why not make the icon a group of grey stones like this (sorry for 10 second creativity!):
