This thread, and its predecessor, has made for the most glorious reading!
Most of the things I can think of have been mentioned, but here's a few little things that are making a big difference for me:
I've recently added motion-sensor lights for inside all of our wardrobes and dimly-lit alcoves, units and cupboards - super cheap and can be recharged too. It's made hunting for things a thousand times easier.
For darker autumn and winter mornings, sunrise clocks are a Godsend at making getting up easier.
Give your mood a boost by creating different playlists for different times. I have one to get me moving on a slow morning and it never fails to help. I also have ones for when I'm trying to relax, when I'm trying to sleep, when I'm getting ready to be sociable. I also have one that I play with my teens that I know will trigger memories of holidays or lovely things we've done together - perfect for mealtimes or car journeys.
If you work at home, have a heated blanket for the winter and don't just put it over you but sit on it and wrap it round you. Also, if you work at home and find it hard to transition into relaxing, have a habit, such as lighting a candle, that helps you to make the jump from work mode to home mode.
Not a household one, but download apps for food/drink places such as Miller and Carter, Prezzo, Dunkin' Donuts, coffee places etc as they offer freebies for your b'day or when business is slow. Put them in a folder if you don't want them cluttering your home screen.
And, always have things in the diary to look forward to - for me, it makes such a difference to my mood.