I made one for my friend's two-year-old (who is currently obsessed with clocks) and it went over well.
Step 1: Gather supplies
A clock set**
spray paint (optional)
*The book needs to be hardcover with a reasonably simple cover (not too much text). It should also be quite thin and large enough for the clock hands. Save money and get your book at the thrift store, no point in ruining a new book and it doesn't have to be in perfect condition.
**I got my clock set at Michaels. I've also seen them at Wal-Mart. Easy to find. Pay attention to the length of the "stem" of the clock. They come in 1/4 to 3/4 inch lengths depending on the thickness of your book.
Step 2: Remove pages!
Also, mark the center of your book by going corner to corner with a straight edge. Or maybe your clock will be off center on the book? Mark wherever you want to drill.
Ok, moving on....
Step 3: Spray paint
Step 4: Drill
Step 5: Assemble your clock
1. Buy a clock with a longer post (they vary in size)
2. Make a table top clock by opening the book and inserting the clock back between the last page and the back cover
3. Cutting a large, square hole in the back cover to inset the clock mechanism (or maybe removing the back cover? That might look weird from the side.
Step 6: Stick on the numbers
Also, use the longest hand as the guide for where the numbers should be. If you have time, make a circle template so your numbers aren't as lopsided as mine. Either way, start with 12, 6, 9 and 3 and then fill in the other numbers.
Step 7: That's it