I have monthly themes
Jan- things that go: cars, trains, planes
Feb- our bodies/ dr and dentist stuff and health
March- rainbows
April - gardens
May- farms
June- bugs
July- space
Aug - oceans
Sept- dinosaurs
Oct- fall and Halloween
Nov- thanksgiving, charity more fall
Dec- Christmas and winter
I am a control freak and love a list
Within the big themes we focus on different aspects of them each week. I have a tub of toys and books for each theme.