I have the Lambency too but I have used it only once. Too heavy plus it didn't fit well on my speed light.
I use a couple of rubber bands to secure it to my speed light. You can use velcro too. This is for landscape mode shots.
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For portrait/vertical mode shot, tilt the flash head like this, then..
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then rotate your camera 90 degrees. Your flash will still be able to bounce light from the ceiling, if there is one!
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Where to get this foam sheet?
You can get A4 size foam sheet from children art supply shops. I used to buy mine from a shop in One Utama. It's RM 2 per sheet. You can make two bounce cards out of it. But i have since found a more economical supply. Here you go:
About RM 5 to RM6 a roll. Available in Jusco, Tesco, Carrefour.
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The dimensions are all here: top width - 6.5", bottom width - 4.5", vertical height - 6".
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You can make it bigger or smaller if you want. I follow Peter Gregg's original dimensions as seen in his A Better Bounce Card clip:
A few sample shots with the DIY Flash Bounce Card:
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Whether shooting bugs or human, as long as you use flash, remember to control the flash output using the FEC. More tips on FEC here.