Abstract: Disclosed herein is a kit including one or more decorative elements (pixel layers) and a substrate. The pixel layers can comprise a pre-shaped layer of rigid, semi-rigid, and/or flexible material that can mate with and/or attach to a substrate (for example, to decorate the substrate). Moreover, the substrate can have an adhesive backing to attach to at least one surface. Example uses of the disclosure include toy building blocks and hobby craft kits (for example, hobby craft kits including creative patterns with instructions, pixel layers, and substrates). The hobby craft kits can be used to make abstract designs for decorating notebook covers, phone covers, and tablet covers.

Abstract: The present invention is a cover system for a device that includes a base with outer and inner surfaces. The outer surface includes a plurality of polygonal recesses, each having a bottom and a plurality of side walls with wall surfaces. Each one of the polygonal recesses has at least one wall in common with at least one other recess. The invention also includes one or more polygonal inserts with, each polygonal insert having a cap with two sides and a first stem extending from one side of the cap. The stem is shaped to form a friction fit when inserted into a recess. Some stems may include an o-ring that fits into a groove extending along all wall surface of a recess.