Things my LOs have loved as they headed towards 12 months: stacking cups, musical toys, bath books, these sea shape things that stick to the bath/shower wall and LO can take off and put on, a walker.
Our walker is a wooden trolley, that has a tray at the bottom that holds a collection of building blocks. It's been a great toy. The girls play with it regularly, and how they play with it is constantly changing as they develop: learning to walk, stacking blocks, carting dolls around in it, pushing your little sister around in it, sorting the blocks and shapes, standing on it like it's a chariot.