Amazon.com: Gobricks GDS-703 Corner Plate 3X6-6x3 Wedge Plates Compatible with Lego 2419 All Major Brick Brands Toys Building Blocks Technical Parts Assembles DIY (151 Sand Green(048),10 PCS) : Toys & Games
LEGO part 3063 - Light Bluish Gray Brick, Round Corner 2 x 2 Macaroni with Stud Notch at BrickScout
LEGO PART 2357 Brick 2 x 2 Corner | Rebrickable - Build with LEGO
Amazon.com: Classic Building Plate 2x2 Corner 100 Piece, Compatible with Lego Parts and Pieces 2420, Creative Play Set - 100% Compatible with All Major Brick Brands(Colour:Black) : Toys & Games