I'm doing something like this to my house this weekend. I LOVE HALLOWEEN!!
Halloween Party Candy Corn Banner... Simple enough that it would be fun to do with kids!
Halloween DIY - Easy Ghost Garland (Source : http://peppermintplum.blogspot.fr/2011/09/ghostie-boo-garland.html)
Halloween- cute idea for the kids at a halloween party or at a wedding to keep them busy!
Dress up regular balloons with Sharpies for Halloween.
Cool Halloween Crafts for Toddlers
halloween party ideas for kids - Google Search
Freeze water in a surgical hand glove to make a creepy ice cube for the punch at Halloween party.