The Crafty Crow is a site FILLED with craft ideas! I personally don't use it much, as I am not all that crafty with my boys, but even I like looking around! You will find the best ideas under the 18 mos-2 yrs label, which showcases crafts targeted at this age range.
If you glance at the right sidebar on this site, you will also find that there are labels for different age groups as well as themes. You'll find these links under the heading "Categories."
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