Some say gray may make things look "cold", but there are grays that offer warmth as well. Sort of a "greige" color is quite popular these days. You can add bright pops of color to bring in warmth as well if you have gray painted walls and that sort of aesthetic.
Beige is quite warm, but sometimes it can look yellow. If you choose a beige with slightly cool tones, you can avoid issues of the sort.
With SO MANY options of paint colors, cabinet styles, and furniture, you really can mix the two schemes. You can have a greige wall with wooden cabinets, or beige walls with some gray accents. Of course, it's all about moderation.
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