Our favorite on-line (and FREE) resources are:
Hubbard's Cupboard: Christian curriculum for age 2-5, great themed ideas, too: https://www.hubbardscupboard.org/index.html
Jean Warren's expertise on-line: https://www.preschoolexpress.com/
Great theme ideas for PreK: https://www.prekinders.com/themes.htm
More theme ideas than you ever will have time to do: https://www.sabine.k12.la.us/zes/resource/default.htm
Great, free resouces used by teachers: https://www.abcteach.com