Photos of the pieces in question would help. Are you using anything with color in it besides the neutrals?

I am actually in sort of the same position you are. We recently bought a second home that is shaker meets Tx hill country. Since it is a second place, we are not going all out on furnishings. Some things we went to Ashley and others, Ikea.

The walls are grey, cabinets and woodwork white, and floor medium dark brown. I have bought the sofa and love seat which are beige linen with throw pillows that are solid dark grey and a pattern of tan/brown/grey. The console table is dark brown (it's Ikea) that will go behind the couch, sort of as an entry table as you walk in the door. It will have 4 natural baskets in the bottom cubbies.

My chairs are linen with brown pattern.

The rug is natural from Ikea

Then I panicked. It is all brown, beige, and natural!!! I have been too afraid to purchase anything else until I get these few pieces in (on Friday). I cannot decide whether to do a grey coffee table or a brown one or a natural wood one. Or maybe White! Or should the entertainment center be grey or

brown Ikea Hemnes or a white wall of ikea Billy bookcases of 41" height and mount the TV above. I saw a houzz pic of the inspiration and thought I saved it, but can't locate it.

I'll post a board of what I have so far and will post after I get stuff in Friday/Saturday. That will help more with what will look best/right. Hopefully, that can give you an idea on which look you want to go.