Pond or not?

As part of my patio redesign, I'm wondering about a bit of a pond incorporated into the patio. I'm considering putting it into a corner of the lower patio, about 3' square, so it would have walls about 3' higher than the water level on two sides.
As part of this, I wondered about a kind of fountain, or spout in the corner. I'd like to do a modern sculpture (using clay, plaster mould, then glass-fibre) - so not a gargoyle. Has anyone any ideas where I could find inspiration for these ideas?

 

So are you putting this on some kind of wall?

 

So are you putting this on some kind of wall?

The patio is on two levels and the upper level is due to be dug out to provide more space on the lower level. In a corner of the lower level is where I intend to put a new pond and it's in the right-angle of this I'd like to put some form of sculpture or fountain.