I have been redecorating our house this past year. Limited budget, because it's rented (we could not leave it untouched - think masses of peeling wallpaper, crumbling plaster around sockets, rotting window frames etc. - but it was also really nice to get a LL who was happy for us to do it). I am no DIY expert and did most of it with my toddler in tow, and there are things I definitely wouldn't choose again, and also things that are a bit boring.
But, we got two tins of Farrow and Ball Breakfast Room Green, much reduced, in a Homebase closing down sale, and bought them pretty much on spec hoping it wasn't a giant mistake. I'm sitting in my bedroom now and it's making me so happy. Lovely soft green, quite dark, and I really it as a background for hanging pictures.
What about you? Doesn't have to be a huge thing, just something like a paint colour or a decision about furnishing that still keeps making you feel good. 
(And bonus points if you can inspire me about bathrooms, because that's next on the list!)