COOL idea to cut out your picture in foam and then add lines with a ballpoint pen.
Unify Handmade: Creating Patterns using Homemade Stamps
Here are some really clever ideas for making unique DIY stamps. For making your own wrapping paper
carved stamps set 2 by Regina (creative kismet), via Flickr
Make your own rubber stamp in 10 minutes! LOTS of goodies here!
Make your own moldable foam stamps
Great round-up of homemade stamps made from household objects | TinkerLab
Homemade stamp using string
Homemade Stamps, using craft foam sheets glued to 'Jenga' wood blocks. Any wood offcuts would do. If you cut all the wood the same size, all the designs can be interchanged for pattern making! Great idea.
Lessons in Art: Print Making for the young and old! Art Lessons from A Texas Artist Laurie Pace