Post every day, is the official tip for new bloggers. That's conflicting with 'get to bed early' - and my feet are cold because I'm already in pyjamas - but I don't have to be up for work tomorrow due to the magic of Christmas, so what the hell.
One perennial tip for a quick happiness boost is to tackle a nagging task, and I had just the thing. My girlfriend got me a print of
http://www.asofterworld.com/index.php?id=565 for my last birthday, and I had it framed, and it came with screws and a wire to hang it, and I never got round to that bit. But this was my official Becoming A Real Person Christmas, so I got my first toolbox, and it was the obvious use for my new screwdriver and tape measure (I even used my spirit level to check it was straight!).
In the spirit of happiness experimentation - that is, seeing whether boasting about it on LJ boosts my happiness even more - here's a photo or two: