Thanks everyone for your reader comments on my last post.
I'm thinking maybe I should clarify that my house doesn't stink...at least I don't think it does. I am not trying to cover-up any smell just give my house a light, pleasant smell when someone walks in. It just doesn't have a special, good smell unless I'm baking (which I do a lot but the smell disappears so quickly).
I DO use a diaper genie (which smells even when there's just a few diapers in it) and Phil and I keep the litterbox very clean because our cat poops on the carpet if it's not cleaned daily. Oh, and I bought a new litter last time just to try something different and Phil actually told me "Wow, that litter smells great!" It was the Arm & Hammer Odor Alert I believe and although I laughed when he told me that, it does smell good without a "masking the odor" type smell.
Anyways, thanks for all the suggestions. I'll have to look into wallflowers. They sound interesting and I don't know what they are. Thanks also for the specific smell suggestions that you enjoy.