I realize I'm posting this months after the last reply, but one of my "tricks" to adding fibre is chickpeas (aka garbanzo beans). They are high in fibre and protein, so they help me stay feeling full. (1 cup = 270 cal, 12 gr fibre (almost 50% of RDA!) and 15 gr protein).
I make a chickpea salad with a reduced fat Italian dressing (and add in some chopped cherry tomatoes, chopped steamed cauliflower, and avocado).
I also make my own hummus. Its really easy to do, and if you use some of the cooking water (or liquid from the can), then you can really cut back on the amount of oil you have to use. I will then use the hummus as a dip for carrots, celery & other veggies.