I've recently discovered that Dafont (the huge free font site) allows registered users to create "selections" (which others might call "collections"). I can make whatever categories I want, and put whatever fonts I want to in those categories. So I've built a bunch of lists!
These lists are handy as heck when you're looking for a free font for a personal project. (For most of the fonts at Dafont, they're only free for personal use. Though every example font I'm showing here is 100% free. Be sure to check each font's licensing information for details.)
These lists will always be growing and changing as I find new fonts to add to them. I've done some deep digging down to the bottom of the categories at Dafont, and hopefully these will help you discover some new favorites!
Holiday Collection: Halloween (sample font: Dire Wolf)
Bones, skulls, dripping blood, lightning, monsters, aliens, and lots of other fonts I felt were Halloweeny!
Holiday Collection: Winter Favorites (sample font: Snowtop Caps)
Snow, stars, candy, cookies, and lots of other fonts with fun wintertime elements!