hmmm Constructed, I love building decks and there is nothing I take more pride in. When I deck I've created works well, it makes me happy. My decks go through a long process of completion, they're played and played. Whenever I see a flaw, or something that could be improved, I do so. I'm also all about flavor If I don't like the flavor of a deck, its scraped. One of the reasons I dismantled a fires deck. while I had customized it a bit, I didn't like the flavor, and the deck wasn't really mine.
Current decks:
Necro(My all time favorite deck, and unlike the fires example above, this is truly MY Necro deck. there are a couple of common themes in a necro deck: hippies, hymns, necros, disks. But the rest is up for grabs, and I build my necro for flavor as much as playability)
Squirrel(an odd construction but mine none the less)
Enchantress Beats(G/W none of that green blue, i'll play 4 argothian enchantress and call it enchantress deck)
Elves( elves are elves, what else can I say)
U/B control( If you can lock down the board with 2 memory crystals a phyrexian plaguelord and a lab rats in your hand, you're good to go)
Mono white(Built originally to be a deck that embodied everything about white, it quickly became the deck that annoyed opponents into submission)
As much as I like constructed, it can only be as fun as the decks you're playing with, and while I strive to make my decks as fun as possible, the person across from me could very well be very bland and uninteresting. Limited, I've only played in a couple of booster drafts...but I played in a ton of Sealed tournaments, and I find them the most fun. Here open these cards and build a deck out of whatever is there. What could be more fun for a person who likes building decks?