Prompt Title: More Photography

Carleen, making your own photography backgrounds with plywood and contact paper is a fantastic, creative approach! It's not only cost-effective but also allows you to tailor each background to the exact look and feel you want for your cake and cookie photos. Without size restrictions, you've got a lot of freedom to experiment.

Given the sizes of cakes you mentioned (3 layer 6 and 8 inch cakes and potential toppers), a good starting point for your background sizes could be at least 30x30 inches. This size gives you plenty of room to compose your shots without worrying about running out of background space. It also allows for some creative freedom with your angles and compositions, especially if you plan to include additional elements like decorations or ingredients in your photos. If you find yourself often photographing larger cakes or wanting more space for creative setups, you might even consider going up to 36x36 inches or larger.

For the 90° plastic brackets to secure the base and back pieces of your plywood backgrounds, you have several options:

1. Hardware Stores: Places like Home Depot, Lowe's, or your local hardware store are excellent places to find a variety of brackets. They usually carry a wide range of sizes and materials, including plastic, which would be lightweight and easy to work with.

2. Online Retailers: Amazon, eBay, and other online platforms have a vast selection of hardware, including 90° plastic brackets. The advantage of shopping here is the ability to browse through different styles and sizes to find the perfect fit for your project.

3. Specialty Woodworking or Craft Stores: These stores often carry specific fittings and fixtures for custom projects, including brackets that might offer a bit more aesthetic appeal alongside functionality.

When selecting brackets, consider the thickness of your plywood to ensure a snug fit. Also, look for brackets that can be easily attached and removed without damaging the wood, as this will allow you to swap out backgrounds effortlessly.

Given your DIY approach, you might also explore using hook and loop fasteners (like Velcro) for an even easier way to change out backgrounds. This could be an alternative to brackets, offering flexibility and ease of use, especially if you're frequently changing scenes.

Your project sounds like it's going to bring a lot of personality and versatility to your photography setup. Can't wait for your baked creations to have the perfect backdrop they deserve!