Oh. Slatted wood ceilings! I have one, painted white, in my kitchen IRL and I love it. It's a big part of the feel of the room. Also, beams would be awesome. And industrial-loft-type looks.
http://3.bp.blogspot.com/-fOjT4O3UCho/UDrzMjdHxcI/AAAAAAAAAng/iZrMrmTSDn4/s640/Beamed+Ceiling+in+Kitchen.jpg
Arts and Crafts style:
https://artsandcraftshomes.com/.image/c_fill,cs_srgb,h_400,q_80,w_620/MTQ0NDY2MzAxNjY3ODQ2MDQz/1_beams_lanterman_ach_wi17.jpg
Industrial conversion:
http://1aike31wshtt3k0e9u2nxtwz.wpengine.netdna-cdn.com/wp-content/uploads/2012/10/industrial-lofts-inspiration-london-3-600x399.jpg
And then there's those textured stucco ceilings, which reflect light poorly. And ceiling decorations:
https://img0.etsystatic.com/051/1/7354894/il_340x270.703687980_q5br.jpg
http://www.covingshop.com/uploads/1/7/6/8/17683905/2534494_orig.jpg
And for really rich Sims...
https://s-media-cache-ak0.pinimg.com/736x/ae/38/d3/ae38d37e23394e29d0f46fb596aaee7e.jpg
(I had to find one where all the ladies had clothes on :/ )
