One thing I really loved as a child were the dot to dot printables. It was so much fun to see what kind of a picture was hiding there!
The challenge was to make the lines as natural looking as possible. (You know - to make a line curve when it was supposed to do so instead of looking angular.)
Some of these dot-to-dots you can find on this site also as coloring pages - you may compare your work to the original drawing. Try to see if you find the original on another page here on online-coloring-books.com
Some of the pictures are here only as dot-to-dots, so you can be surprised at what kind of a picture you will see..
But whichever the case - do show your dot-to-dot art to us all - and do color them too!