Brenham is GREAT have you done a google search? There are several in Brenham. That's where we honeymooned as well as my sister's BIL- they stayed at a ranch in a private cabin. http://www.hat.org/
Wimberly is really neat and has lots of B&B. Hamilton Pool is one of the big attractions there, as well as a glassmaker and MANY unique shops.
There are some in Galveston- there's a very pretty one on Post Office street just past Mission Bible Church.
I went to a wedding at a B&B in Alvin and it was fabulous. I would LOVE to stay there. http://www.oakwindweddings.com/ These shows photos of three bedrooms in the main house, but my sister told me that there's some separate accommodations as well so I suggest talking to them about it. If you look at the wedding pictures it gives you an idea what the grounds and rest of the house looks like.
I have stayed in the Hotel Limpia and it's by far my favorite, but may be a little farther then you want to go. http://www.hotellimpia.com/