If you are looking for a "solid" doormat rather than a paper stencil, common durable materials include:
: This likely refers to a specific funny doormat design or phrase. A popular variation of this theme is the "Please Leave by 9" doormat, which is a humorous welcome mat for introverts who want guests to leave by 9 PM. 9 : She's a Doormat
: In the context of doormat making or DIY projects, "solid paper" often refers to using thick paper or cardstock to create a custom stencil for painting the design onto a coir or rubber mat. Humor and Meanings If you are looking for a "solid" doormat