User blog comment:FairyRaven/Fairy Tail Chapter 349: The Demon Doriate, Review and Commentary/@comment-3424593-20130830125058/@comment-7418318-20130830130213

Gray did create other things than weapons throughout the story too.

The big wall in which racer smashed, ice-make floor and ice-make stairs for example.

But it's as he said in this chapter, at some point he lost his imagination and only made direct attacks or weapons with his ice, probably from growing overconfident in his direct attacks.