This site has downloadable road maps of Texas. There are state maps come in gif or jpg format. There are maps of the entire state, regions, cities, airports and cities.
Information is given about the size and estimated download time for each map.
This site has a selection of maps of Texas including a shaded relief map, a county map, a black and white map, satellite images, and a PostScript map. These are nice large maps. This page from the Merriam-Webster s Atlas has a map of Texas. It also has facts, history, and a picture of the flag. You select a template, enter a title, and select colors for the various counties.