The Jewish National and University Library in Israel have about 30 childrens books available that range from 1879 to 1928 from the subject list. [link updated Nov 2011] The majority are from the early 1920s.
Viewing the books requires a DjVu browser plugin. You can then download individual pages if you want, which are only modestly sized but enormous when opened in an image viewing program like Irfanview. (eg. a 350kb DjVu file opens to ~6000 x 3000 pixel image).
The above images are a random assortment from a dozen or so books which I touched up slightly.