hello, recently I saw an ad for coal mats to make coal loads for coal cars. The mats were about the size of 8.5 x 11 and were textured and looked like coal. These Mats could be cut with scissors to make any size coal load desired. However now I am unable to find that webpage. Has anyone seen that webpage or something similar ? I am in O scale but I guess it could be used for most scales as it is a custom cut. Thankns !!!