Another angle: perhaps the user is referring to a specific type of paper art where lilies are a common design, and "horny" is a mistake. So solid paper work with lily designs. Maybe they want to create lily-shaped paper crafts using thick, solid paper to give it a sturdier finish. It could also relate to making lily decorations, scrapbook elements, or paper flowers for events.
Alternatively, "horny" could be part of a different phrase. In some contexts, "horny" can refer to being sexually aroused, but that seems unlikely here especially with "work" and "solid paper". Maybe it's about creating art using lilies and solid paper? They might be looking for instructions on crafting with lilies and making a solid paper product. horny lily work
I should also consider that the user might have a typo or is using non-standard terminology. The mention of "solid paper" could relate to using paper in a solid form, not just sheets but maybe compressed or layered to make it solid. So combining lily themes with solid paper construction. Another angle: perhaps the user is referring to