I cut the strings to the mini-blind and "harvested" all the slats.
It had just rained, and I am not ready to plant yet, but so you have an idea, I put out the slats to "mark off" the areas for planting. When I actually do this, the dirt won't be mud and I will cut them to fit exactly the space I need and set them in the dirt sideways so only half of it is sticking up.
UPDATE: A reader was kind enough to send a link on the recall of some mini-blinds for lead poisoning. Here's the link. You'll want to be careful what old mini-blinds you use in and out of the garden.