I believe there is no many people who do not like to watch aquariums and who do not feel relaxing while doing that. Colorful exotic fishes are surelly beautiful and attractive but they are not so exotic without adequately environment.
Here you can see some really interesting and unusual aquarium designs.
Here you can see some kind of aquarium labyrinth which is made of few of glass bubbles which are connected with water-filled tubes so fishes can travel from one bubble to another. This aquarium is really one of those which will attract the most of sympathy of your guests.
If you are really a big fan of exotic colorful fishes and aquariums you would probably like to watch them even while washing your dishes. Someone came to an idea to create aquarium inside a sink which could perfectly fit in any kitchen. I am not sure how those fishes feel like when someone washing dishes above them every day.
We have already wrote that aquariums are things which can relax you very much and those two aquariums are example for such thing. It is enough to imagine you sitting there in this room and watching beautiful colorful fishes while swimming in large aquarium and you could feel the wind of relaxation is coming to you. I have to notice that they look like large displays to me.
If you think that aquarium-sink is too much unpractical for you, then, maybe this one could be right choice for you. If you decide to take this aquarium-table you will surely stay near your favorite pets for the most of day but the main consequence of such aquarium design is similar to sink-aquarium, it is questionable how fishes are going to react on different activities which can happen on the table above them.