I decided, instead, that I would do a water garden in a pot. A local garden center, Dragonfly, has an outstanding selection of suitable pots and the various accessories necessary to turn them into a water garden. This will be a perfect addition to fulfill the requirements of the certification program's need for water. The water garden will have aquatic plants growing in it, and I would hope that it would eventually attract breeding amphibians.
Part of the certification program (not a required portion, but a suggested portion) involves reducing or eliminating nonnative turfgrass lawn spaces. I already had a part of the back yard that was beginning to naturally seed with some natives (mostly little bluestem) and I decided that I would help the area along by planting a mix of native grass seeds. I found a place that deals with a lot of Texas native plants, Native American Seed, and found that their Eastern Savannah Grass Mix suits my area perfectly. It has a great variety of grasses: