I have this list saved from somewhere I found online (can't recall the site), but some good ideas:
THEME CARE PACKAGE IDEAS
Birthday: Hostess Cupcakes, box of candles, confetti, birthday cards signed by as many people as possible, goodies like candy and books etc wrapped in birthday paper, party hats
Beach Party Luau: Coconut drink holders, leis, Hawaiian music cd, dried pineapples & other tropical fruits, sunglasses, grass skirts, etc (a lot can be bought in the Oriental Trading Company Catalog), beach ball, inflatable pool, floaties, parrot ( Have a hula good time!)
Hot & Spicy Extreme Pack: Hot sauce, chili powder, garlic powder, extreme Doritos, extreme cheese sandwich crackers, microwave popcorn (use chili powder on this), Nachos, jar cheese, salsa, Rolaids.
Mexican Fiesta: chips, salsa, maracas, inflatable cactus, sombrero, piñata, music
Picnic Basket: Cheap picnic basket, checkered tablecloth, plastic ants, summer sausage & cheese stuff (from Hickory Farms), Hostess Apple Pies, root beer barrels, Frisbees.
At the Movies: New release movie, or taped sitcoms, microwave popcorn (get empty popcorn tubs from movie theater for putting popcorn in), cups & straws, Koolaid mix, movie candy (good-n-plenty, whoppers, malt balls, etc)
Saturday Morning Cartoons: tapes of cartoons, mini boxes of cereal, poptarts, cereal bars, fun socks or boxers, fun pillow cases
Fun & Games: Nerf balls of all kinds, bubbles, cards, card games, hacky sack, squirt guns, balloons, Frisbees, bubble gum, rice krispy treats, cookies, pez & dispensers, popcorn, koolaid, travel games, jump rope, dominoes, silly string
Casino Night: poker cards & chips, black jack wheel, dice
Foot Care Kit: Foot soak, Peppermint foot lotion, foot file, foot powder/spray, Pumice stone, Dr Scholls Inserts, new socks, put all in plastic tub big enough to soak feet in
Fishing in a Box: Gone fishing sign, Fishing Magazines, goldfish crackers, Swedish fish, gummi worms, fishing games, go fish playing cards, fishermans hat, lip balm, sunscreen, and tackle box to pack things in.
Keep in touch kit: writing supplies, journal, pictures, cameras, blank all occasion cards, address book, envelopes
Keep Smiling box: Magic 8 Ball, Mad Libs magazine, Smiley Face Toys, Goofy candy like Sours, Nerds, Laffy Taffy (line box with Smiley face paper), silly string
Lotta Java Pack: teas, cocoa, coffee packs & canned coffees (Starbucks), Milanos cookies, relaxing magazine to read, etc
Staying Healthy: Aspirin, cold meds, sinus meds, vitamins, Visine, Band-Aids, Neosporin, power bars, soup, Gatorade and other health related things, Mens Health magazine, dried fruits
Football: info about local teams, posters w/schedules, Nerf football, home team t-shirt, inflatable goal-post (oriental trading), table top football set
Halloween: decorations, bags of candy, wax lips, spiders & spider webs, scary movies
Thanksgiving: decorations, mini pumpkins & gourds, turkey hat, mini pecan pies, sweet potato chips (Were so Thankful for you!)
Winter: headband, gator, stocking caps, hot chocolate mix, hand warmers, heavy socks, UnderArmor, chapstick
Christmas: small tree w/decorations, music, fake snow, window clings, Santa hat, Christmas lights, card shower
Brainiac: Mental Floss magazine, smart trivia books, puzzle books
Nutty: assorted nuts (pecans, pistachios, trail mix, mixed nuts), salted nut rolls, turtles, card that says Im nuts about you!