I've been looking as well and found something I'd never heard of--Swedish iron! It's kind of a 'dappled grey' and does look rustic. Some shades are very close to black. Quite a few matches come up when you google it; I found the best prices on ebay.

Do you like the contrast of your current knobs/pulls? Or is that what bothers you? You need to figure out what it is about the current knobs and pulls it is that you DON'T like. Personally--I find the contrast jarring. But you may feel it offers punctuation to the room. If it were me,I'd vote for bar pulls in a brushed stainless. But I wouldn't get the kind with the sticky-out bits at the ends (Bottom pull in EAM44's posting.) I would choose pulls like the first or second. The sticky-out bits catch on pockets and such. Very annoying, and can cause falls in people with compromised balance. (I've done a LOT of research on pulls/knobs since we plan/hope to age in-place.) Pulls are better for old hands. One needs much less dexterity to open a cabinet with a pull than a knob.

One of my big goals for my kitchen was to minimize cleaning effort. If you have the same requirement, be sure to consider how easy the hardware will be to keep clean. When I was trying to choose, I went to a couple of big box stores and bought one sample piece of lots of styles and various finishes, took them home and held them up, then returned them. (As long as you are careful with the packaging, they are still perfectly sellable for the store.) You may be surprised to find you like a finish you didn't think of. I think a dark finish might look good in there, since there are some dark veins in Typhoon Green and you have that black chandelier. Some people use one finish on the bottom and another on the top, and it works. It seems that antiqued brass is making a comeback, and that might be pretty with your granite, too. I have stainless appliances, sink, and faucet, but ORB knobs, pulls , and pendants. Keep an open mind and try a bunch. That Aubrey handle is very pretty, though. I also like your pendants.

Polished nickel will look good, will stand out slightly more on the gray than brushed; brushed is a more understated look. I still like my brushed nickel on my gull white cabinets (dark counter, blue walls). Brushed brass is not dark, but would bring another color element into the room. I like the look with soft or off whites; it might depend on just what gray you have though, for it to work.