Filofax's tab dividers only come with side tabs (6 tabs for the A5 size). But when I thought about creating my own, I first had to think about materials. What to make the divider page out of...and the top tab?
I realized that an American manila file folder was made of very similar material to the Filofax tab divider. Because the file folder is larger, one can trace any size and shape tab divider on it, and then cut it out.
And so, I've traced and cut Calendar and Memo-ry top tab dividers from Pendaflex file folders, as illustrated here. The lettering comes from a Brother labelmaker. The equipment requried is a manila file folder, a pencil, a Filofax tab divider, scissors, and a labelmaker.
Edited: Clicking the image now takes you to the entire set of pictures.