Time to create your very own Sketch Book and give yourself a challenge. To create your sketch book you will fold multiple sheets in half. Take half of the sheet and cut a slit in the middle of the fold, leaving 1 1/2" at the ends.
Take the other half and cut 1 1/2" slits at the ends of the folds.
Put one inside the other to create your book.
Now create a cover.
Lastly, number 1-15 on the back and get ready to add some challenges.
Here are some sketch book challenge ideas: