In the past I've used the article Trapped! in the August 2008 issue of Dragon to homecook my own traps. I don't have any idea if the suggested DC's and damage amounts are up to date with the current design standards.
http://www.wizards.com/dnd/files/dragon/366/366_Trapped.pdf
Kobold Quaterly publishes a lot of traps as well.
trap Kobold Quarterly
http://www.wizards.com/dnd/files/dragon/366/366_Trapped.pdf
Kobold Quaterly publishes a lot of traps as well.
trap Kobold Quarterly