Hmmm... you may like something like BeneTint, which is a liquid lip and cheek stain. It looks like a scary dark red in the bottle, but goes on very sheer, is easy to blend and the colour is buildable. For a natural "flushed" look, I put three dots along my cheek and blend from the apple to the hairline. If you ever wanted something more pink or red, you can add layers. This colour is not a typical pink blush at all - it looks very natural, like you're healthy and glowing - just came back from a walk, type of thing.
If that's not really what you're looking for, try some of the MAC Cremeblend blushes - I hear that Ladyblush and Posey are both very natural colours. From Sephora, I know that there are a couple of brands that make good cream blushes, although I haven't tried many of them and can't recommend a shade. Fusion Beauty, Tarte, Make Up For Ever, Josie Maran, Nars, Philosophy, Smashbox and Illamasqua all make various cream blushes available in store and online. If you're going for a very natural, nude, not-made-up look, these may be a better fit for you than a powder blush. For a powder blush, MAC's Cubic is my go-to "nude" colour, and it warms up my face well, and I've heard good things about Blushbaby on fair skin.
For a more "brown/bronze" warm look without having to deal with a bronzed or looking tanned, Smashbox's Blush Rush in Bare may work, and the new Tarte clay-baked blush has a shade called Nude that is also a possibility. You could also try a light dusting of Bare Minerals "Warmth", which looks scary in the pot but could give you some colour without bronzing - I used to use it for contouring with a light hand. If that's too brown, I've heard good things about the All-Over-Face colour by them in Healthy Radiance, as well.
I hope something here helps you out a bit!
