You can definitely flavor cottage cheese, though I admit I haven't been particularly adventurous. Would be interested to hear/try others' recommendations.
I've tried the pb/cc mix... choked it down, but didn't enjoy it much. May have had too much peanut butter. Pepper is good; pepper with a little cayenne is even better.
Other good combos are peaches, granola, blueberries, strawberries, pears, mandarin oranges.
Not recommended: raspberries. Trust me on this one.