Youre talking about an entirely different product and potential market. The manufacturing process, distribution, materials, along with red tape (food safety containers and preparation) are going to have a much higher investment and time to market than OP's niche. This is what makes serving a small niche, and the process involved with executing a business plan around such a niche, not as easy as it initially appears. I love your idea, but it has nothing to do with 'bricks', and has everything to do with 'fun custom confectionaries'.