Now that I'm on record grouching about words I don't like, it seems appropriate to have a few that I do!
Here's the list I've come up with over the past few days. Some of these are good synonyms, some replace words that we overuse, but most of them are just hella fun to say:
Scrumptious, brutalize, foist, kowtow, jaundiced, indubitable, evince, quark, avuncular, visceral, bask, great (when it's used like large, as in "You great pillock!"), wildebeest, maul(ed), ziggurat, berserk (especially when it's pronounced ba-zurk), gibberish, bumbling, aplomb, naughty (in a non-perverted context), eviscerate, schmuck, dossier, squabble, hurtle, ungodly, amok, thingamabob, cornucopia, smorgasboard and defenestrate are some of my personal favorites. The addition of any one of these can singlehandedly brighten up a sentence.
This article from Merriam-Webster lists some other favorite words that people tend to enjoy. I particularly like flibbertigibbet, kerfuffle and persnickety.
This guy's page sports words like Brobdingagian, hullaballoo and demonomania.
And of course, every kind of British slang--words like pillock, ponce, twaddle, blinkered, bugger, collywobbles, git, snog, wanker or gobsmacked could stand a bit more use on this side of the pond.
If you have any pulchritudinous phrases or words to prestidigitate, feel free to deposit them in the comments, ye scallywag!