Keychain Details:

These little patterns take 26 pr. Bobbins, but not much thread per bobbin. If you have ends to use up from a bigger project, a foot or so per bobbin might be enough. I would rather work with more thread on my bobbins; a half yard per bobbin is more comfortable for me! The original prickings would be suitable for sewing thread, easily accessible for most of us, I hope. If your printed copy is much larger than 2.7 mm
square, you will need a thicker thread (Tanne 30 etc.) or you could try reducing the pricking by photocopier.

There are several ways to start this kind of pattern. I'll describe two. Both start at the topmost pin.
1) Hang 2 pairs on the topmost pin, one pair inside the other ("rainbow" style). Work whole stitch - that is, CTC - around pin. Each pair becomes a passive down either side of the pricking. At each dot down the pricking, hang a pair over a pin, and work whole stitch - CTC - through the passives, into the ground (next row of dots) where you work the ground of your choice. Remember to twist each pair before you start the
ground. Ground stitch: I find CT, p, CT a bit flimsy; prefer CTCT, p, CTCT - but, as always, suit yourself. At the widest points of the pricking, the new pair doesn't go into the ground but works through the passive and becomes a second passive to give you more bulk in which to end off the pairs as they leave the ground. That's the plan anyway.
2) Plait start: with 4 pairs, hung rainbow style. Work whole stitch - CTC - around the pin but treat each pair as a single bobbin. This will give a firm start. Now: plait each set of two pairs down either side of the pricking. When you come to a dot, hang in a new pair through the plait. Put a pin in to support. Twist the new pair, ready to do the
ground. Work the plait to the corner, then continue plaiting but instead of adding pairs you will take them out, as they leave the ground. Incorporate them into the plait as they leave the ground, and cut them away, close to the plait. It should be sufficient to plait firmly around the pair, pinching the threads in place, without having to carry the pairs within the plait. Use glue if in doubt about stray cut ends.

Once you've got all the bobbins working the ground, do any of the features, or combination: spiders, roseground, wholestitch or half-stitch diamonds. To be fancy you can add a leaf to the latter, either by borrowing 2 pr. from the diamond to weave the leaf, or by adding in 2 pr. over the threads in the diamond, and sewing them out
when the leaf is finished. This would be fun with a metallic weaver!

End off: If you are using method #1, as pairs leave the pattern, you can work them back alongside the passives before cutting off. Leave a few pairs to tie a short tassel at the bottommost pin, if desired, or seal cut ends with glue that dries clear.