Saw this site linked to on another forum. Not exactly for toe clip use, but pretty cool nonetheless.

http://www.retrofitz.com/

Also, noted one of their favorite shoes to convert was an Onitsuka Tiger Mexico 66, which looks like it might work pretty well for toe clips/straps. The name sounds familiar as well, might have been brought up in one of these threads before.

http://www.zappos.com/onitsuka-tiger-by-asics-mexico-66~1