Dry creeks, Ponds, Waterfalls, all are a great way to enhance your backyard. Your dry creek is a great idea but as said previously standing water is a breeding ground for those nice little friends of ours. I got a pond giving to me by a client and went ahead and put it in
I originally just made up a 5 gal filter myself and it kept those little friends away but you do have to clean the rocks in the filter 2 a year http://s2.photobucket.com/albums/y6/daryledi/Wishingwell%20Pondfilter/
.. It really is not a big deal putting these in and what you get back in return is a very tranquil setting.
Here is quick summary of what we did; Removed grass and dug a trench for the electrical conduit. Dug hole for pond with 3" of a sand bed, installed Landscape fabric everywhere including under the pond, put in 3/4" river rock and used some different size rocks to create a border around the area with river rock, Bought a prefabbed waterfall, pump which came with a fountain and made my own filter and presto. I have recently replaced my own filter and pump with a proper pond filter so I had more water running and I find it easier to clean than my own filter and does keep the water Crystal clear not to mention its a little loader so I can here it on our deck thats about 10 feet away 6 feet off the ground.
Oh by the way the foam you see in the water is not normally there, I have been doing a few things down there and I have to clean it up and replace the water.