Below is a list of links to photographs and information about Texas courthouses that might be of interest to you.
Photographs of all the county courthouses in Texas, taken by Brett Cameron and Ted Lerich. Courthouses are also categorized by architectural style. Also includes information on ordering copies of their photographs.
Texas Historical Commission
This site focuses on historic Texas courthouses and discusses the state's initiative to provide grants for preserving and restoring endangered courthouses.
This site has contemporary and vintage photos of county courthouses in Texas by Bill Morgan. It also has information on ordering his book which features 71 of the state's courthouses.
County Courthouses of Texas
This site has photos of all Texas county courthouses and offers a poster containing all 254 of the courthouses.
These are a photos of the state that were taken on county courthouse trips.