Hey there Tiffany! Welcome back!
Gosh, I am so glad you had a very smooth move. The place looks so spacious and clean.
I had a idea for you kitchen, since you have red, black and white in your DR why don't you carry over those colors into the kitchen. How about a cute black and white check curtains to cover your spices? I think it would be so easy to make. Use red accessories. Is that a red kettle on your spice shelf I see? I know you can't paint, but maybe you could at least use some washable B/W check wallpaper and remove it later, you know that peel and stick kind or those plastic peel and stick tiles on your backsplash? You can use velcro too.
Here look, these come with peel and stick tabs:
http://www.improvementscatalog.com/home/improvements/792927019-metal-kitchen-wall-tiles.html
Something like this (link below) would look so cute and cheerful in your all white kitchen. What color is the floor? Can't see it in the photo.
http://openhouse.homegoods.com/index.php/2007/03/15/black-and-white-and-red-all-over/
That's a great DR set you got and I bet it was a bargain too! Buttery yellow would be nice, but you really have 2 accent colors already and it's your red and black. I would play these colors up in the room and get a nice solid red fabric or yellow would be nice too if you add this color to the room, hang it on one wall and use some theme photos all in black frames hung over the fabric for a focal wall. Maybe on the wall that is over your sideboard? Flowers, fruit, trees or food photos are great in a DR and black and white prints would be good too. Here like this:
http://www.shutterstock.com/pic-22580017-interior-view-of-cozy-family-dining-room.html
You could use some plate stands or wall hangers, for some of your R/B plates and either stand them up on top of your sideboard or hang some on the walls too. Yellow tablecloth and curtains trimmed in black and red? Do you sew? I wouldn't bother with chair pads, unless you can make some in a matching fabric with the tie on straps. The round ones never stay in place and with kids you will be always picking them up off the floor.
I really like your boots picture, looks nice and western, my small bath is done in a wildlife Western theme. I think I would go Western in there and try find some western style accessories in that nice rust brown color of the boots, then use some solid color, turquoise, black, rust and yellow towels for some color (mix them up) and turquoise or rust color area rugs. That should brighten things up some. I would take that photo with you when you go shopping to get a good match. I was thinking a nice rope like a lasso hung in there on the wall might be cute or some cowboy/indian photos in black or rust color frames?
Thanks for all the nice photos!
Have you made any decisions on the bedrooms yet?