Mary, I put the same ones you have in your pic on my ceiling in my bathroom when I remodeled my house. I used Liquid Nails to hold it on the ceiling and then my "power arm strength" - haha - to hold it up long enough for each tile to stay put.
They wash easily and maintain their bright white color - made of polystyrene - bendable to a point but I don't know if they would go around corners well.
I got mine at Menard's but Lowe's and Home Depot have them too. We have the copper colored ones on the wall for backsplash in the cafeteria at work and they look great there as well.
Good luck and I'll be looking forward to seeing your finished project before I tackle mine.
Jared, I like that look as well...the retro microwave