Your pictures:

I don't know how large of an accent area you are speaking of, but mother of pearl tile comes in almost pure white to beiges and tan, to hues of blue. My bathroom remodel is about to get underway. It is all ordered and demo date set. It's mostly Torreon Travertine, My sinks, tub, baseboards and doors are white. I am adding a mother of pearl tiny brick laid tile to the face of my built in shower bench. It is white with tan. I bought samples from Tilebar.com I chose mini brick oyster white. You can read the reviews and see photos of the customers who used the product. We ordered several color samples of the pearl tile and chose this one for our project. It runs $17.99 a sf sheet. Good Luck

What gorgeous rooms--no wonder I'm so smitten with warm grays! These colors go beautifully together--they're classic, in clothing fashion also: taupes grays--light, medium and charcoal creams beiges tans (browns in general) black white silver gold (all metallics) and the list goes on! Mix in some texture, pattern and sparkle, old and new pieces. Accent colors: Brights that I like with this neutral color scheme are pinks and fuschias, yellows and golds, limey greens (see above!) and/or purples/lavenders. Get the basics established (flooring, wall color, large furniture pieces) and have fun playing with the rest!

Seems to be exorbitantly expensive!! For that price you could purchase a reasonable quantity of the individual ingredients and make up a huge batch yourself. Others may have a differing opinion but I do not find the gritty mix to be essential for most houseplants - cacti and succulents being an exception. I would prefer something closer to the 5-1-1 mix to increase water retention so I wouldn't have to water as often. I tend to ignore indoor plants a lot compared to my containers and gardens outside and the heat and lack of humidity indoors can dry out things far too rapidly for my preference to attempt use something like a gritty mix on them.