it depends on your personal taste but here are a few suggestions that have worked for me:

1 medium apple (1) w/ 1/2 Tablespoon of reduced fat peanut butter(1) is only 2 points and satisfying. or you could do 1 T of pb with celery or carrots for the same 2 points

OR

1 slice of light whole wheat toast (.5),
1 slice of 2% american cheese melted (1)
and a tomato (0)

OR

if you like jello, 1 serving of any flavor sugar free is 0 points! also so is a serving of fat free whipped topping so you can combine them for 0 points.

fruit and a scoop of low fat cottage cheese is also good, im not sure of the exact value but it is low and u can have a decent amt of cheese with a cup of fruit(1)

good luck, i will try to think of more ideas