Advent calendar filler ideas

[Mommabear20]

We have 2 DC ages 2&1. E we have refillable advent calendars for them, the idea was always to fill them with sweets or chocolate but as they're still so young I'm leaning more towards basically anything else 😂 but coming up blank as to what we could put in them instead.
Any suggestions would be very welcome!! 🤞

We put in pieces of paper with free activities on such as going to see the lights, making biscuits/gingerbread for Santa. Most pockets have a chocolate coin and the odd one has something else. Day 1 always has a new Christmas book (a note pointing to under the tree) and sometimes I get a hot wheels car or a small figure.

Something they could use in the bath? Rubber ducks or one of those expanding flannels? Some chunky crayons split across the days?

Stickers? Stamps?

Small toys - cars/thomas trains etc? Fun socks. Lip balm. Stick on earrings. Jewellery/bracelets/accessories. Glow sticks. Hair clips. Bath bombs/fizzers/similar. Stickers. Plasters with characters/patterns on them. Crayons. Playdoh/cutters (a tub of dough first then a few shape cutters on other days?) One of those flannels with a character on that comes all compressed (hadn't seen them in years until recently). Decoration to put on the xmas tree.