I have been to a hotel at Muar, Johor. It is made from container. I was shock that it wouldn't be hot even though the sun is shining on it outside. The only defect is that it can't soundproof. You can actually hear it very clearly what people next door are saying.

  There's also few container cafes which are quite famous in KL and Selangor.

Chaiwalla & Co. at The Curve

Bxie Blonde at Publika

Metal Box at Empire Damansara

Boxes Cafe at Pudu Jail.

 Here's are some design ideas for houses, recreation place, etc.