Ключевые слова: 15, 15 th, 15th, 15th anniversary, anniversary, best, birthday, bold, business, celebrate, celebration, ceremony, colours, company, concepts, congratulating, cut out, design element, fifteen, flat design, geometric, geometric shape, glamour, gold, history, holiday, horizontal, ideas, insignia, invitation, line, logo, luxury, minimalist, number, number 15, perfection, shape, sign, simple, simplicity, solid, success, symbol, template, th, tradition, year, years,