DIY Sand and Rock Box by FSPDT. Gdjk -> made this with toilet rolls (aka tunnels) and moon sand instead of play sand. My son loved playing with it. The moon sand cleans up nicely indoors but play sand will be easier to play with when using the small cars.
Heart Patterns and Suncatchers on the DIY Light Table. The light table is simply a large clear under bed plastic storage bin with a string of white Christmas lights inside. It's the easiest and cheapest light table possible