been there, done that, almost exactly.
What we did. Painted all rooms same color- whole house. It is easier and cheaper.
Kids each picked their colors and their bed linens, curtains,etc. was that color. Then I let them put things on the wall to reflect their personality and color choices (I could take those down and change them out whenever they wanted!). Their btrm was the same. I bought a multicolored shower curtain we all liked and they each picked a towel color. That was their color so no fights about towels either. ;-)
Kid friendly. Burbur carpet-super easy to clean up. Or tile, pergo, other hard surfaces. Patterns/colors that hide dirt (literally) and are easy to clean. So my lv rm, kitchen, etc. are stained wood, little wallpaper, and very tough paint by the backdoor (where we enter daily). The rest of the house you turn a corner to see so it is all painted surfaces. By the backdoor I did my thing and ignored contractors/decorators. So my bthrm is off-white fixtures (wanted tan really. LOL) The walls in that hall/entry way are painted first coat glossy (scrubbable), second coat sponged sort of like faux a color from my wall paper (sort of coral/tannish pink), third layer another shade of same color. I took the colors from the kitchen wallpaper so it all blends together as you enter the house. But I can scrub that wall! And it still looks good after all these years. It has seen dirt, clay, mud, blood, food, you name it. I also painted the bthrm by that door in the same fashion and I get a lot of compliments on it. I will be painting the laundry room that way soon. I painted it plain just like they wanted me too and it looks awful. The walls get so dirty and cannot be scrubbed. ugh.
In case you can't tell I live in the country and everyone, kids as well as adults bring in all sorts of dirt. They go to the bathroom to wash up, go to the laundry room for a cold drink (xtra fridge there) and then enter the kitchen.
Identify your main traffic areas/dirt zones. Decorate them to be scrubbable! ;-)
Side note: I did a paint project with dd when she hit about 13 and we painted a jungle on her entire room together. Took us a week and we had a blast. But I used to oil paint, so this was like having a giant canvas. If you feel adventurous you could try that when you have lived in it awhile and the kids are ready for change. But I don't suggest it first moving in. The whole moving in/decorating thing is a huge job in itself!
Good luck,