I would just make a back to my toilet with 1x1x1's and a Print Brick. I would sort of set it up to look like this;
[ ]['] ||
[ ][ ] \/
Apostraphe
The ' ' ' would be the ' print, itself. If you know what I mean. (It's either an Apostraphe or a Commar, In-game. Not entirely sure.)
I would event that then so that when clicked, it would play any sound that sounds like a 'toilet flush'