From a single sheet of plywood and some dollar store bins she built this fabulous organizer. What a great way to use all that awkward space under the sink! Undersink Cabinet Organizer with Pull Out (Diy Storage Bins)
Built-in bookcase for cookbooks! I just want built in bookcases in every room for books! I'll carry a book from one room to another and have a dedicated shelf for my current read. Although, having dedicated space for cookbooks is smart, too.
Even in a tiny house - there's room for something like this - DIY Children Stove with Oven – Ikea Hack. Link is in a foreign language, but the picture shows it well. Cheap end table turned into toy stove. I would have loved this as a kid!