Pond ideas

My kitchen extension will have double doors opening out onto a patio. The house is lower than the garden so when the extension was built to enable the door to open out onto the garden we had to dig out a patio area. 
I've just bought a load of secondhand tiles but I don't really want a large concrete area - so I was thinking I could break it up with a pond /water feature. I don't want fish. This would be for whatever came along and some pond plants

I spotted a large pot in the reclaim yard....but it's not big enough.

I've been Googling ponds- is it easier just to buy a preformed oblong and build around it?? I want to have some water noise? I don't want to pay a fortune either. I spotted a lovely stone bath and thought I could do something like this....


But a little out of my price range.
I will be planting in some spots, I want herbs for cooking near, I thought I would line some of the walls with creeping rosemary.