Step 1: Gather your goods
images (this is what will be on your bookmarks in the end)
printer paper (this is what you'll be printing on. *gasp*)
cardstock (this is what you'll be transferring your images onto)
ruler (i like t-squares, but straight rulers are fine too. anything with a straight edge will do)
pencil (mine's awesome, but you might have a less awesome one, that's fine too)
bone folder (or the back of a spoon, or a dull kitchen knife, something you can score and burnish with)
thin magnets (you'll need two, a positive and a negative)
if you're going to use the xylene transfer method, as i did, then you'll also need some xylene (i used a chartpak colorless blender, but you can also find it in certain orange cleaners, and in some other brands of colorless blender markers) and a laser printer (dinosauric HP laserjet 4+ not pictured. it's camera shy (^_^) )
oh yeah. tea. trust me.
Step 2: Print!
gather your images
mirror them (flip > horizontal will usually do the trick)
print them out
you will need to use a laser printer, because inkjet doesn't work with the xylene transfer method. (of course, you could just print directly on the cardstock with whatever you please, or indeed color on them or scribble or even leave it plain if you happen to particularly enjoy the paper you're using. if you're going to do any of that, you can skip to step 4.)