Foam poppers, pushers, sliders, bugs, and such
I do this:
[url=http://www.warmwaterflyfisher.com/tyingtechniques/Foamsandalpopperplugs.htm:d4e09]Making Foam Plugs for the Foam Sandal Popper[/url:d4e09]
For this (I add rubber legs):
[url=http://www.warmwaterflyfisher.com/flymonth/FOTM012002.htm:d4e09]CLP Cheap Little Popper[/url:d4e09]
[url=http://www.warmwaterflyfisher.com/jarsofflies/Bluegill/jarsofflies_CLP.htm:d4e09]CLP (Cleap Little Popper)[/url:d4e09]
But for Dremel Bugs, this:
[url=http://www.flyanglersonline.com/flytying/fotw2/082205fotw.html:d4e09]Creative Foam Fly Tying - Dremel Bugs[/url:d4e09]
Foam needs to be rough type closed cell, not smooth foam rubber on the flip-flops to work on the Dremel Lathe so it doesn't glaze on the needle mandrel. I have to pick and choose between flip-flops, kneeling pads, etc. But the stuff I occasionally get that does happen to have more foam rubber in it to rough closed cell, I just use for a standard CLP and don't put it on the Dremel. Best of luck.
Best time of year to get flip-flops is during Summer when the stores stock them. They still keep some stocked throughout the year but there probably won't be as many this time of year.