Where are you located? I'm in Mass and we have these unfinished furniture stores called "The Mill Stores" who usually sell these. If you aren't in New England you may just want to look for an unfinished wood or furniture store. Many times they can order them if they don't carry them in stock. Also, if you post a picture and price range for what you want that can help with helping you search.

Unfortunately saying you want a "yellow" is like saying you want a "white" in that there's virtually an unlimited number of colors that will meet that criteria. Do you have a big box hardware store near you? Or even a smaller one. They carry paint, too, so you don't necessarily have to go to a dedicated paint store. Go to the websites of the paint manufacturers. They have online/virtual color visualizers that let you see representations of all their colors. Since your colors are relatively generic and all brands will carry something to suffice, I would suggest you select the paint brand you want to use, then make the drive once and select the color while you're there. You can use the virtual viewers to narrow down chips you'd like to see. If you're trying to match something, take it with you - they should have color matching machines.

I have no idea if this is a legitimate concern, but I'd be concerned about the fact that the legs appear to be attached on the outside rather than under the chair. Makes me wonder if the downward pressure of someone sitting on them would push the legs out and cause them to become loose over time. Doesn't seem like a very smart design.

For starters, true elegance IMO is simple. And I for one understand what OP means by rustic elegance. So: I love white, so I'd go with a creamy white on the walls. I have SW Creamy in a north facing room, and it's warm and soft. Another similar creamy white color, which gets enthusiastic reviews here, is BM Capitol White. I'd get off white linen drapes and an off white rug, maybe with a subtle pattern. Basically various shades of whites with lots of texture. Alternatively, go with a very dark blue wall color and off white drapes, rugs, etc. are there any bedrooms that you like? If yes, can you identify their common elements? Or post them here? Another question: what of this set have you bought/are you planning to get? Everything? Personally, I would not buy the complete set, i.e. get different nightstands, for example.