DD19 always loved getting pressed pennies when she was little. We have them in a folder/booklet, and occasionally we will look at them when we are having a "remember when" time. Other decent souvenirs were silver charms from the outlet store. DD has a charm bracelet with all kinds of Disney characters, including Cinderella's coach and a bunch of villains. We paid about $3 each for the charms, over several trips. We'd go to the outlets just to look for charms. She has also always enjoyed doing Pick-a-Pearl, although we had them set back here at home for a fraction of the prices the Japanese Pavilion charges.
I wear my Disney apron pretty frequently, but MY favorite souvenir is my Mickey cutting board from POP Century. It's one of the flexible ones, so weighed hardly anything and took up even less space in the suitcase! It has different neon/brightly colored circles on it with Mickey heads. I use it several times a week! Of course, I love to use my Disney mugs every day for coffee, although I use my resort specific mugs far more often than the generic mugs they now sell.