Well, yeah, about 50 pages back on this thread... 
Marinades should contain something oily, something acidic, and something flavourful. Which pretty much describes salad dressings too, when you come right down to it. So make up your own combos. Olive oil plus lemon or lime juice or fancy vinegars plus dry mustard or Dijon or chili flakes or spices... the sky's the limit.
Greek yogurt or sour cream with flavourings added makes a great dip. Use onion powder, garlic powder, or the fresh versions, if you can give it time to let the flavours blend, and any herbs or spices that strike your fancy.
Mashed avocado with some garlic powder, salt and pepper, and lime juice is great for dips or salads. You can add cumin and cayenne for a Tex-Mex flavour, or again, just about any combination of herbs and spices that floats your boat. Sour cream/Greek yogurt can also be added.
Ketchup is a little harder. Try pureeing some salsa, perhaps? Or adding some tomato paste to yogurt or avocado. I've never tried that but it might work. Stevia could be added if you absolutely want the sweet, but I would try working on learning to love savoury flavours if I were you. So many wonderful non-sweet flavours out there. Have fun exploring!
No go mash an avocado...
(Bossy, aren't I?)
5'2", 55 years, Primal since April. Pre-Primal weight loss, from 216.6 to 157.8
Primal low: 140.2 (Dec. 3) Goal weight: 135?
Main Primal goal: beating back my CFS enough to function more normally and start writing again
More and more, our life has been governed by specialists, who know too little of what lies outside their province to be able to know enough about what takes place within it.
- Lewis Mumford