Everything from clothes to toys to household goods were on clearance. I was able to pick up a couple shirts from April for $1 each which will fit her this year and most likely next winter also.
I love to hit huge clearance sales like this. It gives me a chance to replenish my "Oh crap I need a quick gift and don't have time to shop" drawer. I keep a decent variety of items in this drawer for various occasions, along with some wrapping paper, colored bags, tissue paper, and small blank cards. I try to stay away from bags and cards that are occasion-specific so I can use them for ALL occasions. I usually pick up the bags and wrapping after Christmas. Red, green, blue, gold, and silver are top colors at Christmas and are great colors for any occasion and age. I do stay away from anything that looks too Christmas-y. Keep in mind though that you can add stickers and ribbon to your package to make it look less like a gift that was forgotten under the tree.
Here is a list of things that I like to keep on hand: candles, pretty journals or notebooks, spreaders w/ decorative small plates, books (good for various ages), puzzles, coloring books w/ crayons
Toys are one thing that it's pretty hard to stock up on because the "what's hot" toys change constantly. Although you are almost always safe buying Barbies for girls and superhero figures for boys. Another good choice to pick up for your "emergency stash" is games - if you come across a great deal anyway.