Just put Smile.DK on repeat, surely.
And lots of happy-hardcore techno.
Maybe some They Might Be Giants, Seven Seconds of Love (Winners, Love Me Like You Used To, etc) and similar, but pick carefully.
Oh, and a few of the more life affirming cuts from MJ Hibbett & the Validators (they of Hey Hey 16k). Praise the Traffic Warden, Down the Narborough Road, Peterborough All Saints Wide Game Team (Group B), Clubbing in the Week, Payday is the Best Day, Pebble and the Boulder, Things'll Be Different, Good Cooking, Nothing in Common, Work's Alright (if It's a Proper Job), Everything's Turning Out Alright, Never Going Back To Aldis, Easily Impressed, Better Things To Do, Sod It Let's Get Pissed, The Gay Train, Lesson of the Smiths, Do The Indie Kid, etc. And though I haven't got to actually hear it yet, most likely "Being Happy Doesn't Make You Stupid".
Probably wanna give "Carol and the Mandolin" a miss (it's a fine song, but counterproductive here). Born with the Century could go either way.
Oh, and of course... The Primal Rhythms of the Bolivian Nose Flautist.
(Yeah, OK, I pulled a lot of those from the online discography, but only because my memory's crap - I can vouch for each of them, and there's a lot more stuff they've put out with a more serious bent. Had forgotten just how much massively upbeat stuff they've done. I'll have to put together a depression-busting mega-mix-tape to shove on in the car from the above list I think)
Can I say that "Lights" thing seemed pretty dull and minor-key to me? Not super uplifting or happy really. Sorry.
Oh, and for a totally gay suggestion

some mid 90s pop - Take That, Spice Girls and all them.