I don't think I'd say anything to them unless it was along the lines of "Upacking is a lot of work, as does figuring out where to put things and trying to decorate. If it's okay, I'd love to come over next weekend and help you paint or organize your closets." Housekeeping matters can be such a touchy subject, as everyone has their own definition of "clean" or "tidy." As far as painting goes, maybe they haven't had a chance to pick out the color that they want to paint? You didn't mention if they were renting or buying, or if they have lived together previously, but could it be that moving put a little strain on their finances (extra $$ was needed for the security deposit or down payment) so they picked up extra hours at work to help with the bills or any extras that are needed in the first month or so of moving into a place (connection fees or deposits for cable, gas, phone company, household items, etc) so they aren't home as much as they normally would be. If they haven't previously lived together, maybe they are still trying to figure out who is going to do what chores or how to combine two households into one? Or, maybe they are just slobs? Who knows!

__________________
"So when I make a big mistake
And when I fall flat on my face
I know I'll be alright
Should my tender heart be broken
I will cry those teardrops knowing
I will be just fine
Cause nothing changes who I am"