You cannot change the texture (not skin ) of a chest, because Bukkit is a server side API. That means that you cannot modify a minecraft client - player of your server - but you can only modify the behavior of the existing client features. If you still need this modification, you can check out SpoutCraft (but I have no further knowledge of that).
spacemoehre PlayerInteractEvent if action is right click block if clicked block is [whatever] open inventory
i have problems to change my chest to a block. There is a NullPointerException at lin: 'c.setType(c.getBlockInventory().getItem(0).getType());'