Themes:
Christmas and Hanukkah:
202 Christmas Way

Christmas and Hanukkah Cards 2008:
Christmas & Hanukkah Cards by Skystars5

Christmas Cards by dgandy

Christmas Cards by Henwen

Chritsmas Cards by Kattzyze

Xmas Cards From Evi

Christmas Bowl and Vase Sets

Christmas Dining Room

Christmas Doors

Christmas Formals

Christmas Mats

Christmas Outfits

Christmas PJs

Christmas Red and Tan Living Room

Christmas Saplings

Christmas Snowflake Seating

Christmas Time Dining Set

Christmas Walls

Christmas07

Holy Night Creche

Kincade Paintings

All found here
http://simfileshare.net/folder/168551/Halloween:
513 Masacre Road

Casper

Halloween Outfits

Halloween Sims

Light on a Cord

Skeletons & Coffins

Skull and Candle

Spiders

Spooky Window

Witches Brew

Wraith Woods

All found here
http://simfileshare.net/folder/168553/Valentine's Day:
Black Lace Top and Red Skirt

Candy Hearts

Diamond Heart Undies

Elegantly Pleated Red Gown

Fun Hearts

Gold Links Nightie

Heart Dress

Heartz 'N' Heartz Lace Living Room

Heartz 'N' Heartz Living Room

Heartz Sun Dress

Little Hearts Sun Dress

Navy Peek-a-boo Heart

Red Heart Gown

Red Silk Nightie

Shiny Red Ruffled Dress

Soft Pink Hearts

Sweetheart Undies

Valentine Bedroom

Valentine Hearts Quilt

Valentine Pantsuit

Valentine Swimsuit

Valentine's Day Cards

Valentine's Day Gown

Valentine's Pajama Set

Victorian Valentine Bedroom

White Lace Velvet Dress

All found here
http://simfileshare.net/folder/168559/