I small sign I made for the Arctic Pack. It should pretty much only be used in a spawnroom, as the picture of the engineer could confuse players if it was in a major playing area. The size of the texture is 512x512 (The image below is 1024x1024). When you download, you will get a zip folder that contains:
The path for the texture should be: materials/signs/careful_its_cold_sign.vtf
If you use it in a map, be sure to credit me (if you forget who I am, I put my name in the vmt).