I found this recipe somewhere years and years ago and it has been a family favorite ever since. The original recipe calls for cucumbers and onions only; I've added the tomatoes and peppers.
Sour Cream Cucumbers
2 large cucumbers, peeled and sliced thin
1/2 medium onion, sliced into thin rings (I use purple or sweet)
1 medium tomato, diced large
1/2 sweet bell pepper, diced (I use yellow to add a different color)
3/4 cup light sour cream
3 tablespoons cider vinegar
1/4 cup Splenda Granular
salt and pepper to taste
Combine the cucumbers, onions, tomatoes, and peppers in a bowl. Combine remaining ingredients and pour over the cucumbers. Mix well and chill about an hour before serving.