CloseShave,
There are a couple of good ways to do it: you can just do a crosshatch pattern down your strop, like this:
XXXXXXXXXXXXXXX
and the results will be fine, or you can take an old knife and shave flecks off of the bar into a small bowl add a small touch of mineral oil, and microwave it for a few seconds at a time until it is pretty warm but bearable to touch. Then, using your finger, smash it, stir it, swirl it, or whatever you need to do to to make it into a homogenous mixture, like you would with a mortar and pestle. This should only take a few seconds.
Then with your already really green and messy finger, apply to the strop as Josh Earl shows in his Sticky on "how to paste a strop". It's located in either the Strops or Hones sections.
If you have a canvas strop, and you want to do the "pool table green" style, put two pieces of painters tape at the extremities of the section you want pasted, like this:
---------+-------------+---------
Then, take the crayon bar and liberally color the heck out of the inside section. Here's where it gets a little hairy - Get an iron with teflon coating on the face, and iron the crayon into the strop. It just melts right in, and hot wax doesn't stick to the teflon. Put an old towel covering your ironing board first, although it shouldn't go through the strop. After ironing, the strop will be really hot, and you can just apply the bar right to the places where it needs it. Since the strop is hot, it melts right in automatically. Keep ironing and applying until it is how you want it.
Let the strop cool, then remove the two pieces of painters tape. (you don't really need the tape, it just makes for very clean lines at the ends of the pasted section, and I think it looks nice. Might as well make it look nice, right? )
Now, take the spine of a kitchen knife, and do a stropping motion over the pasted area. Just the spine, now, ok? This will remove alot of stuff from the top of the strop. Wipe the knife, then keep doing it until you get pretty much nothing off of the strop. Now get a white cloth and rub the heck out of the strop, until you get hardly anything showing up on a clean section of cloth. Now there's not tons and tons on the top of the strop, but it is imbedded into it, and it should work pretty dang well. I've got two strops pasted, and one is very sparse and light, and the other done this way, and they work the same, and I think it looks nice.
Make sure you clean the surface of the iron profusely to ensure you don't iron green flecks into your white shirts!