Umm, in English?
No point you finding out as it's patched. Sometimes during new updates there can be a fault where you can do it.
Their not coming out, the only ones coming out are for retros and the ones which are coming out for normal hotels are just for falling furni and stuff.
It's been tried before, guess what... they failed.
It was English.
Their will never be a way again, loads of people have tried some of them are 'big' people in the 'world of Habbo scripting', I doubt if those certain people can't do it then some one say... YOU, couldn't. ;)
Scripting. It's now pathched though.
Lol? People find new ways to do things ALL THE TIME, just recently someone found a way to smuggle client data in via a piece of habbo clothing. Resulting in a working dice rigger. So dont go around saying that things WILL NEVER be possible. It's not asif habbo can predict and prevent every loophole in their game.
They (habbo) also somewhat regularly let old things that were patched slip through the net in a version update; cast your mind back to maybe a couple months ago when you could smuggle [Chr1] into your mission without any difficulty allowing ServerSide, room-wide moderator commands.
Patched. Use programs to do this. Not mentioning names.
It's done by scripting (Which I recommended you do not attempt)
The way they used to be done was by using programs to edit the client to have a picture added onto the client , It was only clientside and others could not see the changes they made but since the Habbo camera takes pictures of what comes up on your screen it didn't matter so they could take a picture of what ever they eddited/added on and the picture would come out as normal ;).
It used to be possible through injecting client packets to alter the URL of the Cameras in the Habbo swimming rooms, this method has now been patched.
Until Habbo add a new public room with a new method of displaying ads or something it will remain patched.
Although, I'm preeeety sure it's still possible to be acheived via billboards...not sure though.