If you are unsure of the quality, do a quick scan and online search of the brand to make sure they meet the quality you are expecting.
Rice flour can be used for everything from baking (texture does change) to a gluten-free breading.
A sweet potato powder can be used to bind ingredients, added to baking to increase vegetables (root, but still!), and even for sweet potato pancakes!
What are some ways you use non-gluten based flours?