Instead of picking a hobby that you're already skilled at or one that's impossible to master, pick something you feel confident you can see major improvement with.
Buy a ring binder and keep insurance papers, repair receipts and all other paperwork pertaining to the house in it. Storing all your house information in one handy place makes life easier.
Short on closet space? Use a lightweight piece of chain to stagger hanging clothing in tall closets to maximize space. Just loop the first link of the chain over the first hanger, and hang subsequent hangers on every other links after.
Instead of spending hours untangling your Christmas lights every year, simply wrap them around the bar portion of a pants hanger and clip each end—they'll remain untangled all year.