You can buy lots of diet dressings...
I'm on a 'sort of' diet too... had 3 days of salad and then couldn't face any more yesterday.. so had (and I don't recommend this) banana and lowfat cottage cheese on toast.. hmm that was interesting.
Seriously though, try having some humous to dip cucumber / peppers / carrot into. Buy a reduced fat one, but even if you don't it's low gi (keep you fuller longer / keep your blood sugar even so you don't crave choc etc) and is really good for you. Also cottage cheese is great if you like it as you can get virtually fat free stuff. I have also got some of the new Walkers Baked crisps which are 2g of fat and 98calories a pack... fairly good for dieters... and adds a bit of flavour.
Strawberries and beetroot are also considered weightloss foods.. although I'm not sure why. Pickled beet will add some more flavour to your salad too, although it will turn everything else red! Granary bread will also help you to stay full for longer. I use cottage cheese with ham or pickled beetroot instead of adding a margarine type spread on my bread, to keep the fat / calories down!
Keep it up, and good luck!