THAI Lanna. Haven't tried this but it looks promising and clean. BYOB!
Reviews from Urbanspoon: "This place is located right behind the whataburger on 18th just off where 610 and 290 meet. It is a quaint restaurant and the waitress seats you immediately. I ordered the pad thai, cashew ginger shrimp, and thai dumplings. Lets just say i was very pleased with the quality of the food and the taste of this meal. I would definitely go back..."
Pictures of the menu are also available: http://www.urbanspoon.com/r/8/1451580/restaurant/North-Loop-West/Thai-Lanna-Houston