A sheet structure (1000, 1000', 1000", 2000, 3000), comprising: a plurality of first recycled granule portions, each of the first recycled granule portions comprising a first surface layer; and a plurality of second recycled granule portions, each of the second recycled granule portions comprising a second surface layer, the first surface layer of one of the first recycled granule portions being fusingly connected to the first surface layer of another one of the first recycled granule portions and/or the second surface layer of one of the second recycled granule portions, the second surface layer of one of the second recycled granule portions being fusingly connected to the second surface layer of another one of the second recycled granule portions and/or the first surface layer of one of the first recycled granule portions; wherein a material of the plurality of first recycled granule portions is a first recyclable thermoplastic material, a material of the plurality of second recycled granule portions is a second recyclable thermoplastic material, the first surface layer of each of the first recycled granule portions is formed by the first recyclable thermoplastic material through a combination of process parameters, and the second surface layer of each of the second recycled granule portions is formed by the second recyclable thermoplastic material through said process parameters; wherein the process parameters are a highest temperature within a process apparatus, a maximum air pressure difference between interior and exterior of the process apparatus, and an operating duration of the process apparatus; further comprising an upper surface, a lower surface opposite to the upper surface and a panel portion (8, 8') being disposed on at least one of the upper surface and the lower surface, the panel portion (8, 8') having a pattern layer being disposed on a side of the panel portion (8, 8'); wherein at least one of the material of the plurality of first recycled granule portions and the material of the plurality of second recycled granule portions is a transparent material; and wherein the panel portion (8, 8') is exposed to a viewer through the plurality of first recycled granule portions and/or the plurality of second recycled granule portions. a plurality of first recycled granule portions, each of the first recycled granule portions comprising a first surface layer; and a plurality of second recycled granule portions, each of the second recycled granule portions comprising a second surface layer, the first surface layer of one of the first recycled granule portions being fusingly connected to the first surface layer of another one of the first recycled granule portions and/or the second surface layer of one of the second recycled granule portions, the second surface layer of one of the second recycled granule portions being fusingly connected to the second surface layer of another one of the second recycled granule portions and/or the first surface layer of one of the first recycled granule portions; wherein a material of the plurality of first recycled granule portions is a first recyclable thermoplastic material, a material of the plurality of second recycled granule portions is a second recyclable thermoplastic material, the first surface layer of each of the first recycled granule portions is formed by the first recyclable thermoplastic material through a combination of process parameters, and the second surface layer of each of the second recycled granule portions is formed by the second recyclable thermoplastic material through said process parameters; wherein the process parameters are a highest temperature within a process apparatus, a maximum air pressure difference between interior and exterior of the process apparatus, and an operating duration of the process apparatus; further comprising an upper surface, a lower surface opposite to the upper surface and a panel portion (8, 8') being disposed on at least one of the upper surface and the lower surface, the panel portion (8, 8') having a pattern layer being disposed on a side of the panel portion (8, 8'); wherein at least one of the material of the plurality of first recycled granule portions and the material of the plurality of second recycled granule portions is a transparent material; and wherein the panel portion (8, 8') is exposed to a viewer through the plurality of first recycled granule portions and/or the plurality of second recycled granule portions.