Chipboard works good for laser engraving photos, but I like the Brown rather than the Gray.
https://www.amazon.com/Chipboard-Caliper-Cardboard-Regular-Paper/dp/B00X1WNHSG/ref=sr_1_36?rps=1&ie=UTF8&qid=1486240073&sr=8-36&keywords=brown+chipboard&refinements=p_89%3AThunderBolt+Paper%2Cp_85%3A2470955011
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