I've never been able to make a good home made mayo myself for some reason. I have a really old stick blender, but it must not be powerful enough or have the right type of blade on it to make mayo. I've also tried making it my blender with no luck at all, it just became a runny mess.
I have made other condiments from time to time though - although in most cases, I couldn't quite get the flavors to my liking yet. I make home made BBQ sauces from time to time, and home made salad dressings. One of my current favorites is a dead simple recipe using Morton's Natures Seasonings blend - you just mix it with some oil and vinegar and shake it up. I also make fresh salsa pretty often, and I've just recently started making fresh pickles as well. They came out pretty good but my attempt at pickled jalapeno's was a disaster (they turned out just like the canned variety, so there was no advantage what so ever).