Create an 8-bit desert background featuring a simple yet captivating desert landscape. The background should showcase a sandy terrain with minimal vegetation and cacti scattered throughout. The sky should be depicted with a single shade of blue to maintain the limited color palette of the 8-bit style. Design the sand dunes using basic geometric shapes like rectangles or triangles, arranging them to give the impression of depth and movement. The dunes can be of varying sizes and heights, creatin