Freebie digitals are frequently offered by many of the digital stamping websites. You may want to join some of them for their updates, and find that some of them will offer freebie's weekly or monthly! Also, join the digi groups on Paper Craft Planet because freebie's are sometimes offered through contests ... this is a great way too to acquire digital images and try digital stamping out (submit your project and you'll soon be having lots of fun!). I invite you to join DZ Doodles on Paper Craft Planet (and tell all your stamping friends)!
You may also want to check out Elizabeth Dulemba website at http://dulemba.com/. While she states that she doesn't make her illustrations for crafters, you can get as many as you like for free and she has some really cute ones.
Hope this helps.
Happy cardmaking!!
Remember: There are no mistakes in card making, just opportunities for creativity. :-)
Dustin Pike frequently offers freebies on his blog. Sweet n Sassy Stamps offer a new freebie every Thursday. In celebration of WCMD Softpencil has these freebies available. Bee Crafty has some available over at the SNR ning group.
Check out Coloring-book.info . Not sure of actual web address. Followed link in another blog, they are not digital stamps but colouring book images that can be printed - a gazillion to chose from. If I figure out an address with post later. Try googling it.