Here is a list of sites with free svgs:
http://mycricutscrapbooking.com She has several nested designs, like Nestabiltities…
http://susanbluerobot.blogspot.com Go to the right side of her blog and click on 2008, then click on November, scroll down the page until you come to the Nov. 09. 2008 post. She has a bunch of circular designs for download. Her site is full of wonderful downloads, it is very time consuming, but well worth it. She did all her designs on a 6 x 12 mat !!!!!!!!!!!! Great SCAL & Inkscape tutorials also…..she is very talented.
http://dscrapbookingroom.blogspot.com Lots & lots of files….
http://www.mypinkstamper.com This is more for stamping and design ideas using a Circuit, she does great videos….