Maybe not every food on the street will look good at the first sight. But you just have to dare to try it. Because otherwise you will miss the real taste of Thailand.
Restaurants? Nah. You better get the food from the street kitchens. Besides that it is very authentic, delicious and a good way to give something back to the people, it is very very cheap. Depending where you go it is possible to pay only one euro for one meal. In Germany you would not even get a small water in a restaurant for the money.
One of the best things to eat are the skewers which you can see on the photo. The street kitchens have so many different types of skewers that it is hard to decide which one to eat first. In general eating at the street kitchen is safe, just follow one rule and nothing can happen to you: Everything is good as long as the food is fried.