> though I don't have any ideas for what I should make exactly.

That was the best part! You'd turn the box of Lego over and dump it all on the ground and sit down and start building and then suddenly you'd get inspired and an idea would pop into your head and flow mode would engage and you'd lose the next couple of hours just building whatever. Eventually mom/dad/the babysitter would pull you away for food, and maybe you'd talk them into bringing your creation to the dining table so you'd actually eat, but either way, just losing time to building things definitely formed my personality and forged my identity growing up.