Selecting a theme or style for your picture wall is a creative journey that should align with your personal tastes and the ambiance you want to create. You can go for a cohesive theme, like a travel gallery or a family photo wall, or opt for an eclectic mix of artwork and photos for a more bohemian vibe. Start by gathering inspiration from magazines, Pinterest, or Instagram. Once you have an idea, choose frames, colors, and layouts that resonate with your chosen theme or style.