To see or play with Lego blocks in your dream refers to your ability to make something out of a single block. It may refer to the “building blocks” or foundation of some plan. The dream may also be a pun on “let go”. Is there something in your waking life that you need to let go.
To dream that something is make of Lego represents your imagination and creative mind. If you dream that a house is made of Lego blocks, then it symbolises your creative self and your ability to manipulate how you want to be perceived.