Race car monogram wall art for kid's room. Would be easy to draw & paint in the road letter. Use a canvas or framed poster board. Or paint directly on a sheet of metal and add magnets to the bottom of cars so they can be moved all over the road.
Flower letters is a very simple and beautiful DIY project for a baby girl nursery. Buy fake flowers from the dollar store, letters from a crafts store (or just cut them out yourself) and glue the flowers onto the letter.