Red! Blue! Yellow! Black! Green! The colorful little blocks have been out for years and have entertained literally millions of children around the world! There are even adults who play with them!
We personally own about an 18-gallon plastic tub of them and our sons still have a great time playing and building with them. We've bought kits that build Star Wars ships, boats, cars and even an SUV but they usually throw away the instructions for those and build their own creations. Many of which I have taken pictures of to "keep" the project in our memories but free up the blocks to build something else.
One day our boys were quiet playing Legos in their room. At that time, we lived in a mobile home that had air conditioner vents in the floor. When I went to check on them, they had built a whole town complete with an electric generating plant! The "generating plant" was a little building that had a Lego fan on it and when the air conditioner in the house turned on...it turned the fan to generate electricity! How ingenious I thought! Even funnier was the houses and stores were all connected with thread used as power lines!
There were no parents/adults involved in their building...just two boys ages 6 and 9 playing quietly in their room. That told me that Legos would always have a place in our home and I hope they are in yours as well. If you don't have a set for your children, consider purchasing a set and let their imaginations run wild!