Themed Movie NightsWatch a movie with your Sonny Angels which are directly related to their hat's theme ( ie. a konpeito Sonny Angel could suggest a traditional Japanese movie, such like "Spirited Away" ).
A Tiny Tea PartyUse a fancy teacup for yourself, and 1:12 dollhouse tea sets for them. Enjoy your sweets while they enjoy your company!
Desk Buddy for Creative WorkIf you have a special creative endeavour, you could include them nearby as a source of inspiration ( ie. writing a diary entry from their perspective or drawing them in your sketchbook ).
Reading CompanionsHave them around you while you read; they'll make a great audience even if you'd read a few pages out loud.
A Miniature PhotoshootTake picture of them! An obvious example.