I'm not fond of cucumbers, but I've tried them dehydrated like you said, and they are delicious. I also do zucchini and tomatoes seasoned with lemon pepper, and dried like potato chips. Yummy!
Frozen tomatoes are also delicious. Not good for salad, but on a hot summer day, just take one out of the freezer and nibble on it like you would an apple, or cut chunks out of it. You won't believe how refreshing and flavorful they are.