This topic is bumming me out, because I would love to replace our worn-out carpet, but right now we can't afford it - doing our entire house would cost roughly $20,000. Sigh.
Topic - and also related to carpet - my in-laws replaced their carpet about 15 years ago when all of their grandchildren were babies or toddlers, and they chose WHITE. Not even off-white, but pure snowy white. When my husband said "Um, you either have a lot of faith in kids' abilities to not be messy, or you don't mind", MIL said airily "Oh, you and your siblings will just have to keep an eye on your kids and make sure they don't mess it up." Riiiight.
(For the record, we always did keep an eye on our kids, but no-one's perfect. My in-laws' home was an absolute nightmare to visit with small children - not only because of the white carpet, but because of the small breakable figurines everywhere and the unprotected power outlets. And they wondered why we didn't visit more often.)