Create an illusion of rough surfaces and materials that suggest industrial past by leaving some walls or surfaces unfinished and add some rough metal elements.
Large area rugs that won't break the budget. These are 8x10 rugs for under $250. Even gives options for $150 budget. Plus, real life pictures of what some look like!
Seamless transition between wet/dry areas. Use same tile/finish/colors all over to visually expand.
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Bathroom inspiration open shelves, black wall