One combination that I've found is particularly fun to search for is "bird" items, because there are all sorts of cute things that come up! Specifically, "bird cosmetic" has become a favorite to just search and see what is available.
This adorable cosmetic case would be adorable to carry odd and ends inside of a diaper bag:
|Etsy.com, $16 - Seller: Linascorner|
This cosmetic is a bit more grown up and would look cute for Mommy to grab out of the diaper bag to run into Starbucks or where ever she needed to go:
|Etsy.com, $24 - Seller: vonicadesigns|
I also love this little flat one to stash extra lip glosses or store loyalty cards...
|Etsy.com, $6 - Seller: JPATPURSES|
|Etsy.com, $28 - Seller: fieldofroses|
So if birds make you think Spring as well... head over to Etsy and check out the huge selection of adorable bird cosmetic bags!