I like these pages as a source of activities for young children:
http://www.allfreecrafts.com/kids/index.shtml
http://www.allkidsnetwork.com/crafts/holidays.asp
http://www.origami-instructions.com/ (origami)
http://webinstit.net/webinstit_en/artsplast/techniques/techniques_recap.htm (Arts)
http://www.enchantedlearning.com/crafts/
http://www.dltk-kids.com/
http://www.amazingmoms.com/htm/kidsart.htm
http://www.activityvillage.co.uk/kids_crafts.htm
http://www.scissorcraft.com/
GERMAN sites: (I don�t speak German, but it is understandable for me through te pictures and photograph) :-))l
http://www.kidsweb.de/
http://www.bastel-tipps.de/de/?GSS=789d5e8bb597eab8173f57201b5e0b6a
http://www.basteln-gestalten.de/
http://www.kidsaction.de/basteln.htm
http://www.kinder-malvorlagen.com/ (templates, colourings)
http://www.i-creative.cz/ (in Czech, butyou can download some templates)
I hope that some of these websites will be helpful for you.