A while ago I found some Spiderman and Hulk stickers at Target. I probably won't ever use them since I haven't been to Universal in awhile. I would be glad to send you some. Also my LSS has Spiderman stuff. For IOA- I've seen Dr. Seuss stuff online and I think my LSS has Cat in the HAt stickers. You can use anything dinosaur related for Jurassic Park. Back to USO- try Scrapyourtrip.com for great Egypt related papers and diecuts (Revenge of the mummy). Anything water/shark related for Jaws. For Nick studios there are tons of products out, Spongebob, Blue's CLue's, Dora the Explorer, Rugrats.
Hope that helps a bit. Just send me a pm if you want the Hulk/Spiderman stickers!
Sara