I'm not using a pattern for this, just made a loooong chain, then double crocheted around both sides, then at each end I'd dc 2, ch 2, dc 4, ch 2, and dc 2 all in the top loop, and at that point you've got a loooong rectangle. I tied off and on each side I'll be "triple-crocheting" by my definition, which means wrapping around the hook three times instead of one like you'd do to double crochet.
So it's look like |-///- . (Eep, looks kinda like a syringe. :P)